ZL50017 Data Sheet
30
Zarlink Semiconductor Inc.
Bit Name Description
15 - 9 Unused Reserved. In normal functional mode, these bits MUST be set to zero.
8STIO_PD_
EN
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.
7UnusedReserved. In normal functional mode, these bits MUST be set to zero.
6BDLBi-directional Control
5 - 4 Unused Reserved. In normal functional mode, these bits MUST be set to zero.
3 - 1 BPD2 - 0 Block Programming Data
These bits refer to the value to be loaded into the connection 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.
0 MBPS Memory Block Programming Start:
A zero to one transition of this bit starts the memory block programming function. The
MBPS and BPD2 - 0 bits in this register must be defined in the same write operation.
Once the MBPE bit in the Control Register is set to high, the device requires two
frames to complete the block programming. After the programming function has fin-
ished, the MBPS bit returns to low, indicating the operation is completed. When MBPS
is high, MBPS or MBPE can be set to low to abort the programming operation.
Whenever the microprocessor writes a one to the MBPS bit, the block programming
function is started. As long as this bit is high, the user must maintain the same logical
value to the other bits in this register to avoid any change in the device setting.
Table 5 - Internal Mode Selection Register (IMS) Bits
External Read/Write Address: 0001
H
Reset Value: 0000
H
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0000000STIO_
PD_EN
0 BDL 0 0 BPD
2
BPD
1
BPD
0
MBPS
BDL STio0 - 15 Operation
0 normal operation:
STi0-15 are inputs
STio0-15 are outputs
1 bi-directional operation:
STi0-15 tied low internally
STio0-15 are bi-directional
