zl50021 Zarlink Semiconductor, zl50021 Datasheet - Page 58

• Manufacturer Part Number: zl50021
• Description: Enhanced 4 K Digital Switch With Stratum 3 Dpll
• Manufacturer: Zarlink Semiconductor

15 - 9
External Read/Write Address: 0001
Reset Value: 0000
3 - 1
Bit
8
7
6
5
4
15
0
14
0
STIO_PD_
RBEREN
TBEREN
BPD2 - 0
Unused
Name
BDH
BDL
EN
H
13
0
12
0
Reserved. In normal functional mode, these bits MUST be set to zero.
STio Pull-down Enable
When this bit is low, the pull-down resistors on all STio pads will be disabled.
When this bit is high, the pull-down resistors on all STio pads will be enabled.
Bi-directional Control for Streams 16-31
Bi-directional Control for Streams 0-15
PRBS Receiver Enable: When this bit is low, all the BER receivers are disabled. To
enable any BER receivers, this bit MUST be high.
PRBS Transmitter Enable: When this bit is low, all the BER transmitters are disabled.
To enable any BER transmitters, this bit MUST be high.
Block Programming Data: These bits refer to the value to be loaded into the connec-
tion memory, whenever the memory block programming feature is activated. After the
MBPE bit in the Control Register is set to high and the MBPS bit in this register is set
to high, the contents of the bits BPD2 - 0 are loaded into bits 2 - 0 of the Connection
Memory Low. Bits 15 - 3 of the Connection Memory Low and bits 15 - 0 of Connection
Memory High are zeroed.
Table 19 - Internal Mode Selection Register (IMS) Bits
11
0
H
10
0
9
0
Zarlink Semiconductor Inc.
PD_EN
BDH
BDL
STIO_
0
1
0
1
8
ZL50021
58
BDH
STio16-31 are bi-directional
STi16-31 tied low internally
STio0-15 are bi-directional
STi0-15 tied low internally
7
bi-directional operation:
bi-directional operation:
STio16 - 31 Operation
STio16-31 are outputs
STio0 - 15 Operation
STio0-15 are outputs
STi16-31 are inputs
STi0-15 are inputs
normal operation:
normal operation:
Description
BDL
6
RBER
EN
5
TBER
EN
4
BPD
3
2
BPD
2
1
BPD
1
0
Data Sheet
MBPS
0