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1 four port bypass and repeater for fc-al S2072 february 18, 2000 / revision d ? features ? micropower bipolar technology ? ansi x3t11 fibre channel compliant ? monolithic clock recovery unit C retimes & buffers received data C jitter peaking < 0.1 db ? lock detect function C frequency detection ? four port bypass circuits ? suitable for both coaxial and optical link ? low power operation 0.93 w typical ? 106.25 or 53.125 mhz reference clock ? compact 10 mm x 10 mm 64 pin pqfp package ? 3.3 v supply applications ? fc-al nodes ? raid ? jbod ? san general description the four port bypass and repeater for fc-al cir- cuit is used in full-speed (1.0625 gb/s) disk arrays. it contains a monolithic clock recovery unit (cru), a lock detect feature and four port bypass circuits. the S2072 may be used to implement a single chip arbitrated loop port bypass retiming node. the figure 1. S2072 functional block diagram device specification four port bypass and repeater for fc-al S2072 S2072 performs the function of four port bypass cir- cuits followed by a clock and data retimer (cdr). the cdr retimes incoming serial data, detects whether a valid signal is present and outputs a low jitter serial data stream. functional description the S2072 functional block diagram is shown in fig- ure 1. the S2072 performs two functions. the first function is a quad port bypass circuit (pbc) for nodes in a fc-al system. the low jitter accumula- tion of the port bypass path is essential in these systems. the second function is to restore signal quality in raid drives using the fc-al link configu- ration. the S2072 clock and data recovery pll pro- vides low jitter transfer peaking and high jitter tolerance. in addition, the lock detect circuit monitors the incoming signals for frequency, which is useful for link performance monitoring and detection of channel present. jitter performance input jitter tolerance is defined as the amplitude of frequency dependent, random and deterministic jitter that causes the clock recovery pll to violate the ber specifications. the S2072 complies with the minimum jitter toler- ance requirements proposed by the fibre channel jitter working group when used with differential in- puts and outputs as shown in figure 2. in addition, the S2072 is designed for minimum jitter generation and jitter transfer specifications. this allows the opti- mum system design for arbitrated loop architectures. 0 1 0 1 0 1 0 1 ddo0 ddi0 en0 ddo1 ddi1 en1 ddo2 ddi2 en2 ddo3 ddi3 en3 in cdr outp/n lockdet bypass refclk lckrefn refsel lpf1 lpf2
2 four port bypass and repeater for fc-al S2072 february 18, 2000 / revision d figure 2. fc-al jbod application for repeaters cdr 01 01 01 01 disk storage fc-al disk drive lrc interlock s2070 fc xcvr e_store disk storage fc-al disk drive lrc interlock e_store disk storage fc-al disk drive lrc interlock e_store optics or copper s2058 S2072 dual sc or db-9 normal normal normal bypass pulldown for bypass in absence of disk drive s2070 fc xcvr s2070 fc xcvr
3 four port bypass and repeater for fc-al S2072 february 18, 2000 / revision d device description the S2072 provides a port bypass function for up to 4 nodes in an fc-al circuit, with low jitter accumulation. an integrated repeater reduces jitter and restores sig- nal amplitude levels for optimal signal integrity. jitter performance of the pll is specified by jitter tolerance and jitter transfer. in accordance with ansi x3t11, jitter tolerance is divided into random, deterministic, and frequency dependent jitter. figure 3 illustrates the components of random, deterministic, and frequency dependent jitter that must be tolerated to be ansi x3t11 compliant. frequency dependent jitter tolerance frequency dependent input jitter tolerance is defined as the peak to peak amplitude of sinusoidal jitter ap- plied on the input signal that causes the clock recovery to violate ber specifications. see figure 4. random jitter tolerance random jitter tolerance is the amount of jitter with a gaussian distribution that the clock recovery pll must tolerate. deterministic jitter tolerance deterministic jitter tolerance is the amount of deter- ministic jitter that the clock recovery pll must tolerate. jitter transfer jitter transfer is defined as the ratio of jitter on the output signal to the jitter applied on the input signal versus frequency. jitter transfer requirements are shown in figures 4 and 5. the measurement condition is that input sinusoidal jitter up to the mask level in figure 4 is applied and the output jitter is measured for compliance to the mask of figure 5. the jitter transfer mask includes specifications for both jitter peaking and bandwidth. lock detect the S2072 lock detect circuit monitors the selected input signal to detect the presence of the channel. this is done by monitoring the frequency content of the in- coming data. the frequency monitor circuit checks the difference between the divided down recovered clock and the externally supplied reference clock (refclk). if the frequency difference between the recovered clock and the reference clock varies by more than 100 ppm the part will be declared out of lock. in the out of lock state, the pll will lock to the local reference clock and periodically poll the serial data inputs looking for data with valid frequency content. figure 3. input jitter tolerance figure 5. jitter transfer specification figure 4. frequency dependent jitter tolerance mask freq dep dj(isi) rj 10 -12 0 329 612 940 ps ber f c /25,000 (42.5 khz) cut-off freq a f c /1,667 (637 khz) cut-off freq b time (unit interval - ui) 1.5 0.4 frequency (hz) (khz) = cut-off freq @ 1,0625 gbps jitter transfer acceptable range slope = -20 db/decade fc = 2 mhz peaking = 0.2 db
4 four port bypass and repeater for fc-al S2072 february 18, 2000 / revision d table 1. pin assignment and descriptions e m a n n i pl e v e lo / i# n i pn o i t p i r c s e d p t u o n t u o . f f i d l c e p v l o 8 3 9 3 e e s ( . p o o l e h t n i c b p t x e n e h t o t d e t c e n n o c e b o t t u p t u o l a i r e s a t a d d n a k c o l c e h t y b d e m i t e r n e e b s a h t u p t u o s i h t ) . 2 e r u g i f . l l p y r e v o c e r p n i n n i . f f i d l c e p v l i 6 1 5 1 . t i u c r i c s s a p y b t r o p s u o i v e r p e h t m o r f t u p n i l a i r e s p 0 i d d n 0 i d d p 1 i d d n 1 i d d p 2 i d d n 2 i d d p 3 i d d n 3 i d d . f f i d l c e p v l i 4 3 1 6 0 6 0 5 9 4 3 4 2 4 y b n e v i r d e b d l u o h s t u p n i s i h t . s s a p y b t r o p e h t o t t u p n i l a i r e s f o e n o y n a . s s a p y b t r o p e h t o t d e t c e n n o c e v i r d k s i d l a - c f e h t n i s i c b p s t i f i k c o l b r d c e h t o t d e t u o r e b y a m s r i a p t u p n i e s e h t . e d o m s s a p y b t r o p n i e r a s c b p r e h t o e h t d n a e d o m l a m r o n k l c f e rl t ti9 2 . e v i t c a e g d e g n i s i r , l l p e h t r o f k c o l c e c n e r e f e r 1 f p l 2 f p l g o l a n a 2 3 3 3 s r o t s i s e r d n a r o t i c a p a c r e t l i f p o o l l a n r e t x e e h t . s n i p r e t l i f p o o l . s n i p e s e h t o t d e t c e n n o c e r a n f e r k c l e t a t s 3 l t t i5 3 e h t o t k c o l o t d e c r o f e b l l i w l l p e h t , e v i t c a n e h w . w o l e v i t c a . ) k l c f e r ( k c o l c e c n e r e f e r l a c o l t e d k c o ll t to4 3 d e k c o l s i l l p e h t s e t a c i d n i t e d k c o l , e v i t c a n e h w . h g i h e v i t c a e h t o t k c o l l l i w l l p e h t , e v i t c a n i n e h w . m a e r t s a t a d l a i r e s e h t o t . n o i t i d n o c a t a d f o s s o l a g n i t a c i d n i k c o l c e c n e r e f e r l a c o l p 0 o d d n 0 o d d p 1 o d d n 1 o d d p 2 o d d n 2 o d d p 3 o d d n 3 o d d . f f i d l c e p v l o 3 1 2 1 4 6 3 6 8 5 7 5 6 4 5 4 t u p n i e h t e v i r d d l u o h s s t u p t u o e s e h t . s r i a p t u p t u o s s a p y b t r o p . e v i r d k s i d l a - c f e h t f o s t r o p 0 n e 1 n e 2 n e 3 n e l t ti 2 2 3 2 5 2 6 2 t r o p e h t , e v i t c a n i s i n e n e h w . h g i h e v i t c a . l o r t n o c s s a p y b t r o p s s a p y b t r o p , e v i t c a s i n e n e h w . e d o m s s a p y b n i e b l l i w s s a p y b . e d o m l a m r o n n i e b l l i w
5 four port bypass and repeater for fc-al S2072 february 18, 2000 / revision d e m a n n i pl e v e lo / i# n i pn o i t p i r c s e d d n gd n u o r g , 0 2 , 4 1 , 1 , 7 3 , 0 3 9 5 , 8 4 e r a d n a e c a f r u s e i d e h t o t d e t n u o m y l l a c i s y h p e r a s n i p d n u o r g l a m r e h t t s e b r o f . h t a p l a m r e h t e h t f o t r a p t n a t r o p m i n a d n u o r g a o t d e t c e n n o c e b d l u o h s s n i p d n u o r g l l a , e c n a m r o f r e p . e l b i s s o p f i s a i v e l p i t l u m g n i s u e n a l p c c v , 0 4 , 1 1 , 2 , 4 4 , 1 4 2 6 , 7 4 . y l p p u s r e w o p v 3 . 3 + a c c vg o l a n a 9 1 8 2 . r d c e h t r o f y l p p u s r e w o p v 3 . 3 + a d n gg o l a n a 8 1 7 2 . r d c e h t r o f d n u o r g s s a p y b l e v e l 3 l t t i7 1 n o i t a r e p o p i h c l a m r o n . t s e t g n i r u t c a f u n a m r o f d e s u . h g i h e v i t c a e h t d n a e d o m t s e t n i t u p s i 2 7 0 2 s , e v i t c a n e h w . e v i t c a n i n e h w . g n i t s e t y r o t c a f r o f d e s s a p y b e b l l i w l l p l e s f e rl t ti6 3 z h m 5 2 . 6 0 1 s w o l l a , e v i t c a s i l e s f e r n e h w . w o l e v i t c a z h m 5 2 1 . 3 5 s w o l l a , e v i t c a n i s i l e s f e r n e h w . k c o l c e c n e r e f e r . k c o l c c n d , 8 , 7 , 6 , 5 , 1 2 , 0 1 , 9 , 1 3 , 4 2 , 2 5 , 1 5 , 4 5 , 3 5 6 5 , 5 5 . t c e n n o c t o n o d table 1. pin assignment and descriptions
6 four port bypass and repeater for fc-al S2072 february 18, 2000 / revision d figure 6. S2072 pinout 1 2 3 4 5 6 7 8 9 10 11 19 20 21 22 23 24 25 26 27 28 29 62 61 60 59 58 57 56 55 54 53 52 48 47 46 45 44 43 42 41 40 39 38 S2072 64 pin pqfp top view 37 36 gnd vcc ddo3p ddo3n vcc ddi3p ddi3n vcc vcc outn outp gnd refsel 35 34 33 lckrefn lockdet lpf2 17 18 vcca gnd dnc en0 en1 dnc en2 en3 gnda vcca refclk bypass gnda 30 31 32 gnd dnc lpf1 64 63 vcc ddi1p ddi1n gnd ddo2p ddo2n dnc dnc dnc dnc dnc ddo1p ddo1n 51 50 49 dnc ddi2p ddi2n 12 13 gnd vcc ddi0n ddi0p dnc dnc dnc dnc dnc dnc vcc ddo0n ddo0p 14 15 16 gnd inn inp
7 four port bypass and repeater for fc-al S2072 february 18, 2000 / revision d figure 7. S2072 64 pin pqfp package thermal management e c i v e dr e w o p e g a k c a p x a m 1 q q q q q a j 2 7 0 2 sw 8 1 . 1w / c ? 0 5 1. power is measured with outputs terminated.
8 four port bypass and repeater for fc-al S2072 february 18, 2000 / revision d r e t e m a r a pn o i t p i r c s e dn i mp y tx a ms t i n us n o i t i d n o c t r t , f e m i t l l a f d n a e s i r k l c f e r d e r i u q e r0 . 3s n. % 0 9 o t % 0 1 t f y c n e u q e r f k l c f e r d e r i u q e r e c n a r e l o t 0 0 1 C0 0 1 +m p p d n a k l c f e r n e e w t e b e c n e r e f f i d . y c n e u q e r f a t a d x r c de l c y c y t u d k l c f e r d e r i u q e r0 40 6% t d d t u p t u o ] 0 : 3 [ o d d o t t u p n i y n a y a l e d n o i t a g a p o r p 4s n. 8 e r u g i f e e s t o d d r t o d d f e m i t l l a f d n a e s i r a t a d l a i r e s t u o o t ] 0 : 3 [ o d d 5 8 10 5 3s p e l p m a s a n o d e t s e t , % 0 8 o t % 0 2 . s i s a b s n o i t a c i f i c e p s r e t t i j t u o j rn / p t u o ) s m r ( r e t t i j m o d n a r4 1s p s i s a b e l p m a s a n o d e t s e t , s m r t u p n i r e t t i j c f e s a c t s r o w h t i w . l a n g i s t u o j dn / p t u o ) p - p ( r e t t i j c i t s i n i m r e t e d0 5s p e l p m a s a n o d e t s e t , k a e p o t - k a e p r e t t i j c f e s a c t s r o w h t i w s i s a b . l a n g i s t u p n i t j q e r f e c n a r e l o t r e t t i j t n e d n e p e d y c n e u q e r f n / p n i 1 . 0i u e r b i f r e p k s a m e c n a r e l o t r e t t i j . n o i t a c i f i c e p s r e t t i j l e n n a h c t j n a rn / p n i e c n a r e l o t r e t t i j m o d n a r2 2 . 0i u. k a e p - o t - k a e p t j dn / p n i e c n a r e l o t r e t t i j c i t s i n i m r e t e d8 3 . 0i u. z h m 5 2 1 . 3 5 > @ k a e p - o t - k a e p r f x j o t t u p n i ( ) t u p t u o o t n / p n i m o r f g n i k a e p r e f s n a r t r e t t i j n / p t u o 1 . 0b d d v t u o - o t - k a e p l a i t n e r e f f i d t u p t u o l c e p v l g n i w s e g a t l o v k a e p 0 0 0 10 0 2 2p - p v m0 5 w v o t c c . 9 e r u g i f e e s . v 0 . 2 - d v n i k a e p - o t - k a e p l a i t n e r e f f i d r e v i e c e r y t i v i t i s n e s t u p n i 0 0 20 0 6 2p - p v m v c c . d e l p u o c c a , v 3 . 3 =y l l a n r e t n i v o t d e s a i b c d c c . v 5 6 . 0 - . 9 e r u g i f e e s t r e t t i j s m r y n a , n o i t a l u m u c c a r e t t i j m o d n a r ] 0 : 3 [ o d d o t t u p n i 35 s p h t i w d e t a l u m u c c a r e t t i j s m r n o d e t s e t . n r e t t a p a t a d 7 . 8 2 k . s i s a b e l p m a s t r e t t i j j d y n a , n o i t a l u m u c c a r e t t i j c i t s i n i m r e t e d ] 0 : 3 [ o d d o t t u p n i 0 1 0 4 s p d e t a l u m u c c a r e t t i j c i t s i n i m r e t e d . n r e t t a p a t a d 5 . 8 2 k h t i w . s i s a b e l p m a s n o d e t s e t table 2. ac characteristics
9 four port bypass and repeater for fc-al S2072 february 18, 2000 / revision d r e t e m a r a pn o i t p i r c s e dn i mp y tx a ms t i n us n o i t i d n o c v h o ) l t t ( e g a t l o v h g i h t u p t u o2 . 2v i h o a m 1 . 0 C = v l o ) l t t ( e g a t l o v w o l t u p t u o5 . 0v i l o a m 2 . 1 + = v h i ) l t t ( e g a t l o v h g i h t u p n i0 . 2v v l i ) l t t ( e g a t l o v w o l t u p n i8 . 0v i h i ) l t t ( t n e r r u c h g i h t u p n i0 5a v n i v 4 . 2 = i l i ) l t t ( t n e r r u c w o l t u p n i0 0 6 -5 -a v n i v 5 . 0 = table 3. lvttl dc characteristics table 4. lvpecl input/output dc characteristics r e t e m a r a pn o i t p i r c s e dn i mp y tx a ms t i n us n o i t i d n o c v h o e g a t l o v h g i h t u p t u o v c c 5 1 . 1 - v v l o e g a t l o v w o l t u p t u o v c c 5 6 . 1 - v v h i e g a t l o v h g i h t u p n i v c c 2 . 1 - v c c 5 . 0 - v v l i e g a t l o v w o l t u p n i v c c 0 . 2 - v c c 4 . 1 - v i h i t n e r r u c h g i h t u p n i0 5 2 -0 0 2a i l i t n e r r u c w o l t u p n i0 5 2 -0 0 2a
10 four port bypass and repeater for fc-al S2072 february 18, 2000 / revision d r e t e m a r a pn i mp y tx a ms t i n u v ( e g a t l o v y l p p u s r e w o p l t t c c ) 5 . 04 +v v ( e g a t l o v t u p n i c d l c e p p n i ) 0 v c c v v ( e g a t l o v t u p n i c d l t t p n i ) 5 . 0 -0 . 5v t u p t u o h g i h r o f s t u p t u o o t d e i l p p a e g a t l o v c d v ( e t a t s l t t n i ) 5 . 0 - v c c 5 . 0 + v i ( t n e r r u c t u p t u o l t t t u o ) h g i h t u p t u o , c d ( ) 5a m i ( t n e r r u c t u p t u o l c e p t u o ) h g i h t u p t u o , c d ( ) 4 2a m t ( e r u t a r e p m e t e g a r o t s g t s ) 5 6 -0 5 1c ? r e t e m a r a pn i mp y tx a ms t i n u v ( e g a t l o v y l p p u s r e w o p c c ) 3 1 . 3 +7 4 . 3 +v s a i b r e d n u e r u t a r e p m e t n o i t c n u j0 3 1c ? e g n a r e r u t a r e p m e t g n i t a r e p o t n e i b m a00 7c ? y l p p u s t n e r r u c c c i 2 0 5 25 9 2a m n i p t u p n i l c e p v l y n a n o e g a t l o vv c c 2 Cv c c v n i p t u p n i l t t y n a n o e g a t l o v0v c c v table 5. absolute maximum ratings table 6. recommended operating conditions 1 1. amcc guarantees the functional and parametric operation of the part under "recommended operating conditions," except where specifically noted in the ac and dc parametric tables. 2. icc is measured with outputs not terminated. electrostatic discharge (esd) ratings the S2072 is rated to the following esd voltages based on the human body model: 1. all pins are rated at or above 1000 v, except pin 32 and pin 33. the following are absolute maximum S2072 device stress ratings. stresses be- yond those listed may cause permanent damage to the device. these are stress ratings only. operation of the device at these or any other conditions beyond those indicated in the electrical characteristics section of this document is not implied.
11 four port bypass and repeater for fc-al S2072 february 18, 2000 / revision d figure 8. timing waveforms figure 9. differential input/output voltage power supply sequencing when the S2072 is operated with a 5 volt controller, it is recommended that power be applied to the S2072 before or simultaneously (time difference less than 1 ms) with the application of power to the 5 volt controller. if this condition cannot be met, series re- sistance of at least 33 ohms is required on all ttl inputs driven from the 5 volt environment. please note that 33 ohms is already recommended on dynamically switching input signals such as refclk and lckrefn to limit overshoot and ring- ing. static control lines such as en[3:0], bypass, and refsel should also be provided with series resistors of at least 33 ohms (100 ohms recom- mended) to limit input current if the 5 volt environ- ment is powered while the 3.3 volt vcc of the S2072 is off. in p/n ddi p/n ddo p/n t dd v in/out (+) v in/out (? v in/out (+) ?v in/out (? v swing d v in/out = 2 x v swing note: v in/out (+) C v in/out (-) is the algebraic difference of the input/output signals.
12 four port bypass and repeater for fc-al S2072 february 18, 2000 / revision d figure 10. high speed differential lvpecl outputs figure 11. high speed differential lvpecl inputs backplane 150 150 S2072 0.1 f 0.1 f zo=50 zo=50 inp inn 0.1 f 0.1 f v cc - 0.5 v S2072 100 zo=50 zo=50 figure 12. loop filter circuit lpf1 24 2.2 f (x7r type) lpf2 24 S2072
13 four port bypass and repeater for fc-al S2072 february 18, 2000 / revision d amcc is a registered trademark of applied micro circuits corporation. copyright ? 2000 applied micro circuits corporation amcc reserves the right to make changes to its products or to discontinue any semiconductor product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the informati on being relied on is current. amcc does not assume any liability arising out of the application or use of any product or circuit described herein, neither do es it convey any license under its patent rights nor the rights of others. amcc reserves the right to ship devices of higher grade in place of those of lower grade. amcc semiconductor products are not designed, intended, authorized, or warranted to be suitable for use in life-support applications, devices or systems or other critical applications. applied micro circuits corporation ? 6290 sequence dr., san diego, ca 92121 phone: (858) 450-9333 ? (800) 755-2622 ? fax: (858) 450-9885 http://www.amcc.com c e r t i f i e d i s o 9 0 0 1 xxxx xx prefix part no. package x i f e r pe c i v e de g a k c a p t i u c r i c d e t a r g e t n i - s2 7 0 2p f q p n i p 4 6 C f q ordering information x

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