EXSTOR - 1 XRS10L220

7

REV. 1.02

SERIAL ATA II: PORT MULTIPLIER / PORT SELECTOR

3.0

FUNCTIONAL DESCRIPTION

A top-level view of the XRS10L220 is shown in Figure 3 outlining the interfaces to the device and the required

support components. The data path can be seen at the top of the device. This includes the two output transmit

and input receive paths at the top left, providing the upstream interface to the host, and the two output transmit

and input receive paths at the top right, providing the downstream interface to the target devices. The clocking,

control, and configuration interfaces are shown below the dotted line.

The XRS10L220 incorporates identical instantiations of a dual-channel Serial ATA II 3 Gbps PHY macro. This

common building block provides a uniform implementation with common characteristics and a common

register map, but provides a functional implementation of independent PHY blocks. Digital logic

implementations of Serial ATA link layer blocks along with port selector and port multiplier logic provide the

remainder of the data path within the XRS10L220. In addition, management and control interfaces including an

MDIO interface for register control, a JTAG interface for boundary scan purposes, and a resistor calibration

circuit complete the device. A block diagram of the XRS10L220 is shown in Figure 4.

S IT _P /N [1:0]

S IR _P/N [1:0]

D R A C T[1:0]

H B A C T

R ES E TB

P W R D N B

M D C

M D IO

R BIA S

S O T _P/N [1:0]

SO R _P/N [1:0]

C M U _R E F_P /N

X O D

X O G

TC K

TD I

TD O

TM S

TR S T

S e ria l A TA U p stream

In terfa ce to H B A s

C ontrol an d

S ta tu s

In terfa ce

C on fig uration

In te rface

S e ria l A TA D o w nstrea m

Inte rface to D evices

R efe ren ce C lock

C rysta l O scilla tor I/O

JTA G

Interfa ce

V D D A

C alib ra tio n R e sistor

49 .9

Ω ± 0.5%

P S_S ID E B AN D _B

PO R TS EL

SATA II

3GPHY

SIT0

SIR0

PORT

SELECTOR

SATA II

3GPHY

SIT1

SIR1

SATA II

LINK

LAYER

RATE

ADJUST

FIFO

SATA II

LINK

LAYER

SATA II

LINK

LAYER

SATA II

3GPHY

SOR0

SOT0

PORT

MULTIPLIER

SATA II

3GPHY

SOR1

SOT1