zl50021 Zarlink Semiconductor, zl50021 Datasheet - Page 19

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

R9, N10, P9,
M4, N6, R6,
M8, N8, P8,
R8, M9, N9,
P7, R7, N7,
PBGA Pin
H13, H15,
K13, K15,
G12, G13
J15, H11,
J14, H12,
K14, J11,
J12, J13,
Number
R10
N12
R12
B15
R11
N11
LQFP Pin
Number
16, 18,
20, 22,
23, 24,
25, 26,
27, 28,
30, 32,
34, 36,
82, 84,
86, 87,
88, 89,
90, 91,
92, 93,
94, 96,
37, 38
98, 99
141
44
40
39
42
Pin Name
DTA_RDY
R/W_WR
D0 - 15
DS_RD
A0 - 13
ODE
CS
Zarlink Semiconductor Inc.
Output Drive Enable (5 V-Tolerant Input with Internal Pull-up)
This is the output enable control for STio0 - 31 and the
output-driven-high control for STOHZ0 - 15. When it is high, STio0
- 31 and STOHZ0 - 15 are enabled. When it is low, STio0 - 31 are
tristated and STOHZ0 - 15 are driven high.
Data Bus 0 to 15 (5 V-Tolerant Slew-Rate-Limited Three-state
I/Os): These pins form the 16-bit data bus of the microprocessor
port.
Data Transfer Acknowledgment_Ready (5 V-Tolerant
Three-state Output) This active low output indicates that a data
bus transfer is complete for the Motorola interface. For the Intel
interface, it indicates a transfer is completed when this pin goes
from low to high.
An external pull-up resistor MUST hold this pin at HIGH level for
the Motorola mode. An external pull-down resistor MUST hold this
pin at LOW level for the Intel mode.
Chip Select (5 V-Tolerant Input) Active low input used by the
Motorola or Intel microprocessor to enable the microprocessor port
access.
Read/Write_Write (5 V-Tolerant Input) This input controls the
direction of the data bus lines (D0 - 15) during a microprocessor
access. For the Motorola interface, this pin is set high and low for
the read and write access respectively. For the Intel interface, a
write access is indicated when this pin goes low.
Data Strobe_Read (5 V-Tolerant Input): This active low input
works in conjunction with CS to enable the microprocessor port
read and write operations for the Motorola interface. A read access
is indicated when it goes low for the Intel interface.
Address 0 to 13 (5 V-Tolerant Inputs): These pins form the 14-bit
address bus to the internal memories and registers.
ZL50021
19
Description
Data Sheet