PM5381-BI PMC-Sierra, Inc., PM5381-BI Datasheet - Page 156

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

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2000489, Issue 4
Register 0012H: Rx2488 Analog CRU Control
CRU_MODE[6:0]
Bit
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Note: This field should be set to 2Bh for optimal operation.
The CRU Mode control bits are used to place the CRU in one of the following modes:
Table 9 CRU Mode Control
Mode Bits
6:5
4:3
2
1:0
Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Description
Bandwidth Selection via Internal Loop Filter Modes:
Narrowbanding Mode: This field selects the current source for Narrowbanding of
the CRU’s oscillator.
00 – Reserved
01 – CSU Narrowbanding (default)
10 – Reserved
11 – Reserved
Override Lock to Reference. When high, forces the CRU to remain locked to the
data. When low, the CRU state machine controls the CRU.
Set to 01 or 11 (equivalent) for OC48 operation. All other settings are reserved.
Function
Reserved1
CRU_RESET
Reserved1
RX2488_ENABLE
Reserved
LOCK_TO_REF
IDDQ_ENABLE
Reserved0
SDLE
CRU_MODE[6]
CRU_MODE[5]
CRU_MODE[4]
CRU_MODE[3]
CRU_MODE[2]
CRU_MODE[1]
CRU_MODE[0]
00 = Reserved
01 = 2.5 K ohm (default, recommended)
10 = 5.0 K ohm
11 = Reserved
S/UNI-2488 Telecom Standard Product Datasheet
Default
0
0
0
1
1
0
0
0
0
0
1
0
1
0
1
1
Released
156