PM8610-BIAP View Datasheet(PDF) - PMC-Sierra, Inc

Part Name

Description

Manufacturer

PM8610-BIAP

SBI Bus Serializer (SBS)

PMC-Sierra, Inc 

SBS Telecom Standard Product Data Sheet

Preliminary

Pin Name

OV5[4]

OV5[3]

OV5[2]

OV5[1]

Type

Tristate

Output

JUST_REQ[4]

JUST_REQ[3]

JUST_REQ[2]

JUST_REQ[1]

Bidir

Pin No.

AD21

W2

L1

C13

AC21

AA2

A4

Y2

Function

Outgoing Bus Payload Indicator (OV5[4:1]). The active high

signal, OV5[x], locates the position of the floating payload for each

tributary within each of the corresponding outgoing SBI/SBI336 or

TelecomBuses.

In SBI/SBI336 mode:

This active high signal locates the position of the floating payloads

for each tributary within the SBS/SBI336 structure. Timing

differences between the port timing and the bus timing are

indicated by adjustments of this payload indicator relative to the

fixed bus structure. All movements indicated by this signal must be

accompanied by appropriate adjustments in the OPL[x] signal.

In 19.44 MHz SBI mode, the SBS can drive this signal at uniquely

assigned tributary columns within the SBI bus structure.

In locked TVT mode or fractional rate link mode this signal may be

driven but must be ignored by the receiving device.

In TelecomBus mode:

This signal identifies tributary payload frame boundaries on the

corresponding outgoing data bus. OV5[x] is set high to mark the

V5 bytes on the bus.

OV5[1] can be part of either a 19.44 MHz SBI or TelecomBus when

combined with OV5[4:2] or can be used as part of a standalone

77.76 MHz SBI336 or TelecomBus.

OV5[4:2] are held tri-state when configured for 77.76 MHz

operation.

OV5[x] is updated on the rising edge of SREFCLK.

Shared Bus Justification Request (JUST_REQ[4:1]). The SBI

Bus Justification Request signal, JUST_REQ[x], is used to speed

up, slow down or maintain the minimal rate of a slave timed SBI

device.

When the SBS is configured to be connected to a physical layer

device, JUST_REQ[4:1] is an input. In SBI mode, JUST_REQ[4:1]

is aligned to OC1FP[1] and the Outgoing bus. In SBI336 mode,

JUST_REQ[1] is aligned to the IC1FP[1] and Incoming Bus.

When the SBS is configured to be connected to a link layer device,

JUST_REQ[4:1] is an output. In SBI mode, JUST_REQ[4:1] is

aligned to IC1FP[1] and the Incoming bus. In SBI336 mode,

JUST_REQ[1] is aligned to OC1FP[1] and the Outgoing bus.

This active high signal, JUST_REQ[x], indicates negative timing

adjustments on the corresponding SBI bus when asserted high

during the V3 or H3 octet, depending on the tributary type. In

response to this the slave timed SBI device should send an extra

byte in the V3 or H3 octet of the next frame along with a valid

payload signal indicating a negative justification.

This signal indicates positive timing adjustments on the

corresponding SBI bus when asserted high during the octet

following the V3 or H3 octet, depending on the tributary type. The

slave timed SBI device should respond to this by not sending an

octet during the V3 or H3 octet of the next frame along with a valid

payload signal indicating a positive justification.

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use

36

Document ID: PMC-2000168, Issue 3

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