PM5381-BI PMC-Sierra, Inc., PM5381-BI Datasheet - Page 69

• Manufacturer Part Number: PM5381-BI
• Description: ATM UNI, Single Channel ATM PHY Interface for 2488.32Mbps
• Manufacturer: PMC-Sierra, Inc.

9.9
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2000489, Issue 4
Analog Miscellaneous Signals (10)
Pin Name
TRSTB
Pin Name
ATP_2488[0]
ATP_2488[1]
ATP_1250[0]
ATP_1250[1]
C0_CRU
C1_CRU
C0_CSU
C1_CSU
RES
RESK
Type
Schmidt
TTL Input
Type
Analog
Analog
Analog
Analog
Pin
No.
D28
Pin
No.
AJ18
AK18
AG2
AF3
AG18A
H18
AJ20
AK20
AE4
AG1
Function
The active low test reset (TRSTB) signal provides an
asynchronous S/UNI-2488 test access port reset via the IEEE
P1149.1 test access port. TRSTB is a Schmidt triggered input
with an integral pull up resistor. TRSTB must be asserted at
some point after power up and before the device registers are
accessed.
Function
Four analog test ports are provided for production testing
only. These pins must be tied to analog ground (AVS) during
normal operation.
ATP_2488[1:0] are the test ports for the 2488 Mbps analog
circuitry. ATP_1250[1:0] are the test ports for the 777.76 MHz
LVDS analog circuitry.
The analog C0_CRU and C1_CRU pins are reserved for an
external capacitor for the clock recovery unit. A 10nF non-
polarized capacitor across the two pins is required for all
applications. The C0_CRU and C1_CRU pins must not be
left floating (no connection).
The analog C0_CSU and C1_CSU pins are provided for an
external capacitor for the clock synthesis unit. A 100nF
capacitor must be placed between these two pins for all
applications.
The C0_CSU and C1_CSU pins must not be left floating (no
connection).
Reference Resistor Connection. (RES/RESK) An off-chip
3.16kW ±1% resistor is connected between the positive
resistor reference pin RES and a Kelvin ground contact RESK
for the APS port LVDS reference. An on-chip negative
feedback path will force the 0.8V VREF voltage onto RES,
therefore forcing 252µA of current to flow through the resistor.
RESK is electrically connected to AVSS within the block, but
should not be connected to AVSS, either on-chip or off-chip.
S/UNI-2488 Telecom Standard Product Datasheet
Released
69