PM8610-BIAP PMC [PMC-Sierra, Inc], PM8610-BIAP Datasheet - Page 47

• Manufacturer Part Number: PM8610-BIAP
• Description: SBS Telecom Standard Product Data Sheet Preliminary
• Manufacturer: PMC [PMC-Sierra, Inc]

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2000168, Issue 3
Pin Name
SREFCLK
ICMP
Type
Input
Input
Pin No.
C5
C7
SBI Reference Clock. The SBI reference clock, SREFCLK, is a
reference for the incoming and outgoing SBI bus and TelecomBus
interfaces. SREFCLK is either a 77.76 MHz clock with a nominal
50% duty cycle or a 19.44 MHz clock with a nominal 50% duty
cycle. IC1FP, IDATA[4:1][7:0], IDP[4:1], IPL[4:1], IV5[4:1],
ITPL[4:1], ITAIS[4:1] and JUST_REQ[4:1] are sampled on the
rising edge of SREFCLK. OC1FP, ODATA[4:1][7:0], ODP[4:1],
OPL[4:1], OV5[4:1], OTPL[4:1], OTAIS[4:1] and JUST_REQ[4:1]
are updated on the rising edge of SYSCLK.
When the incoming and outgoing buses are running at 77.76 MHz,
this signal should be tied to SYSCLK.
When the incoming and outgoing buses are running at 19.44 MHz,
this signal should be tied to SREFCLK19.
Incoming Connection Memory Page. The incoming connection
memory page select signal, ICMP, controls the selection of the
connection memory page in the Incoming Memory Switch Unit,
IMSU. When ICMP is set high, connection memory page 1 is
selected. When ICMP is set low, connection memory page 0 is
selected.
The byte location during which ICMP is sampled is dependant on
the mode of operation.
4-Frame SBI/SBI336 mode:
ICMP is sampled at the C1 byte position of the incoming bus on the
first frame of the 4-frame multiframe (marked by IC1FP[1]).
Changes to the connection memory page selection is synchronized
to the frame boundary (A1 byte position) of the next four frame
multiframe.
48-Frame SBI/SBI336 mode:
ICMP is sampled at the C1 byte position of the incoming bus on the
first frame of the 48-frame multiframe (marked by IC1FP[1]).
Changes to the connection memory page selection is synchronized
to the frame boundary (A1 byte position) of the next 48-frame
multiframe.
TelecomBus mode:
ICMP is sampled at the C1 byte position of every frame on the
incoming bus (marked by IC1FP[4:1]). Changes to the connection
memory page selection are synchronized to the frame boundary
(A1 byte position) of the next frame.
CMP is sampled on the rising edge of SREFCLK.
Function
SBS Telecom Standard Product Data Sheet
Preliminary
47