PM8611-BIAP PMC [PMC-Sierra, Inc], PM8611-BIAP Datasheet - Page 29

• Manufacturer Part Number: PM8611-BIAP
• Manufacturer: PMC [PMC-Sierra, Inc]

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2010883, Issue 2
Pin Name
INTB
General Function (9 Signals)
SYSCLK
SREFCLK
ICMP
Type
Open
Drain
Output
Input
Input
Input
Pin
No.
G12
A12
B12
B10
Function
Interrupt Request Bar. The active low interrupt enable signal
(INTB) output goes low when an SBSLITE interrupt source is active
and that source is unmasked. INTB returns high when the interrupt
is acknowledged via an appropriate register access. INTB is an
open drain output.
SBI System Clock. The 77 MHz SBI reference clock signal,
SYSCLK, is the master clock for the SBSLITE device. SYSCLK is
a 77.76 MHz clock, with a nominal 50% duty cycle. RC1FP,
OCMP and RWSEL are sampled on the rising edge of SYSCLK.
TC1FP is updated on the rising edge of SYSCLK.
SBI Reference Clock. The SBI reference clock, SREFCLK, is a
reference for the incoming and outgoing SBI bus and TelecomBus
interfaces. SREFCLK is a 77.76 MHz clock with a nominal 50%
duty cycle. IC1FP, IDATA[7:0], IDP, IPL, IV5, ITPL, ITAIS,
JUST_REQ and ICMP are sampled on the rising edge of
SREFCLK. OC1FP, ODATA[7:0], ODP, OPL, OV5, OTPL, OTAIS
and JUST_REQ are updated on the rising edge of SYSCLK.
This signal should be tied to SYSCLK.
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 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). Changes
to the connection memory page selection is synchronized to the
frame boundary of the next four frame multiframe.
48-Frame 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).
Changes to the connection memory page selection is synchronized
to the frame boundary 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). Changes to the connection
memory pate selection are synchronized to the frame boundary of
the next frame.
CMP is sampled on the rising edge of SREFCLK.
SBSLITE™ Telecom Standard Product Data Sheet
Preliminary
28