ZL50074GAC ZARLINK [Zarlink Semiconductor Inc], ZL50074GAC Datasheet - Page 21

• 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]

8.0
The ZL50074 has a generic microprocessor port that provides access to the internal Data Memory (read access
only), Connection Memory and Control Registers.
The port size can be configured to be either 32 bit or 16 bit, controlled by the D16B pin.
The port works with either Motorola or Intel type microprocessor buses, selected by the IM pin.
8.1
The Data Memory, Connection Memory and Control Registers are assigned 32 bit fields in the ZL50074 memory
space. The Address Bus, A18 - 0, controls access to each 32 bit location. Byte addressing is also provided to give
the user programming flexibility, if access to less than 32 bits is required.
Each 32 bit memory or register location spans four consecutive addresses. Example:
•
The Least Significant address identifies the Most Significant Byte (MSB) in the 32 bit field, as illustrated in Table 4.
8.2
In 32 bit mode (D16B = 0), all 32 bits of the Data Bus, D31 - 0, may be used for write and read transfers. D31 on the
bus maps to Bit 31 of the internal memory or register, D30 maps to Bit 30, etc. The least significant address bits, A1
- 0, and the Data Transfer Size inputs, SIZ0 - 1, identify which bytes are being accessed.
In Motorola Bus mode (IM = 0), A1 - 0 identify the first byte in the 32 bit field to be transferred, as shown in Table 5.
The SIZ0 - 1 inputs indicate the access transfer size, as shown in Table 6.
The 32 bit Group Control Register for TDM Group 0 is located at address range 40200 - 40203 Hex
Addressing
32 Bit Bus Operation
Microprocessor Port
Table 4 - Example of Address and Byte Significance
Address (Hex)
Table 5 - 32 Bit Motorola Mode Byte Addressing
40200
40201
40202
40203
A1
0
0
1
1
Zarlink Semiconductor Inc.
A0
0
1
0
1
ZL50074
21
Memory/Register Bits
Byte Addressed
Bits 31:24 (MSB)
Bits 7:0 (LSB)
Bit 31:24
Bit 23:16
Bits 23:16
Bit 15:8
Bits 15:8
Bit 7:0
Data Sheet