ZL50074GAC ZARLINK [Zarlink Semiconductor Inc], ZL50074GAC Datasheet - Page 12

• Manufacturer Part Number: ZL50074GAC
• Description: 32 K x 32 K Channel TDM Switch with 128 Input and 128 Output Streams
• Manufacturer: ZARLINK [Zarlink Semiconductor Inc]

Pin Description (continued)
B18, E15
D14
C15
D15
A19
B17
Pin
C5
B7
SIZ0-1
BERR
Name
WAIT
D16B
R/W
DTA
DS
IM
Data Strobe Input (5 V Tolerant Input)
Active low input used with CS to enable read and write access to
the ZL50074.
Read/Write Input (5 V Tolerant Input)
This input controls the direction of the data bus lines (D31 - 0)
during a microprocessor access. This pin is set high and low for the
read and write access respectively.
Data Transfer Acknowledge (5 V Tolerant, 3.3 V Tri-state
Output with Slew-Rate)
This active low output indicates that a data bus transfer is
complete. An external pull-up resistor is required to hold this pin
HIGH when output is high-impedance.
Transfer Bus Error Output with Slew Rate Control (5 V
Tolerant, 3.3 V Tri-state Outputs with Slew-Rate Control)
This pin goes low whenever the microprocessor attempts to access
an invalid memory space inside the device. In Motorola bus mode,
if this bus error signal is activated, the data transfer acknowledge
signal, DTA, will not be generated. In Intel bus mode, the
generation of the DTA is not affected by this BERR signal. An
external pull-up resistor is required to hold a HIGH level when
output is high-impedance.
Data Transfer Wait Output (5 V Tolerant, 3.3 V Tri-state Output
with Slew Rate)
Active low wait signal output. An external pull-up resistor is required
to hold this pin HIGH when output is high-impedance.
Data Transfer Size/Upper and Lower Data Strobe Inputs (5 V
Tolerant Inputs)
Motorola 32-bit mode - signals indicate data transfer size, refer to
Section 8.0.
Motorola 16-bit mode:SIZ0 - LDS, SIZ1 - UDS.
Active low upper and lower data strobes, UDS and LDS, indicate
whether the upper byte, D15 - 8, and/or lower byte, D7 - 0, is being
accessed.
Intel 32/16-bit mode: SIZ0 - BE0, SIZ1 - BE1
Active low Intel type bus-enable signals, BE1 and BE0
Microprocessor Port Bus Mode Select (5 V Tolerant Input)
Control input:
0 = Motorola mode
1 = Intel mode
Microprocessor Port Bus 16/32 Bit Mode Select (5 V Tolerant
Input with Internal Pull-down)
Control input:
0 = 32 bit data bus
1 = 16 bit data bus
Zarlink Semiconductor Inc.
ZL50074
12
Description
Data Sheet