MT92220BG Zarlink Semiconductor, MT92220BG Datasheet - Page 21

• Manufacturer Part Number: MT92220BG
• Description: Description = 1023 Channel Voice Over IP/AAL2 Processor ;; Package Type = Epbga ;; No. Of Pins = 608
• Manufacturer: Zarlink Semiconductor

Data Sheet
2.3
The MT92220 CPU interface supports both Intel and Motorola modes, in both 8-bit or 16-bit data bus and
multiplexed or non-multiplexed address/data pins. The MT92220 supports 128 Megabytes of addressable space,
therefore extended addressing is necessary. The CPU interface directly addresses four control words, delegated
for indirection accessing. All of the register spaces in this section provide extremely fast CPU access times.
0000
0001
0010
0011
0100
0101
0110
0111
1xxx
CPU_MODE
a. The cpu_ale pin is interpreted in all modes. However, it is not necessary in the non-multiplexed modes and can be
b. The address placed on the cpu_a[14:0] pin is a word address in 16-bit mode and a byte address in 8-bit mode. The
[3:0]
address, when placed on the cpu_d pins, is always a byte address.
tied to VCC.
Intel/Motorola Interface
Intel, 16 bit data bus,
non-multiplexed
Intel, 16 bit data bus,
multiplexed.
Intel, 8 data bus,
non-multiplexed
Intel, 8 data bus,
multiplexed
Motorola, 16 bit data bus,
non-multiplexed
Motorola, 16 bit data bus,
multiplexed
Motorola, 8 bit data bus,
non-multiplexed
Motorola, 8 bit data bus,
multiplexed
Reserved
INTERFACE TYPE
000h
004h
008h
00Ah
Table 2 - CPU Interface Mode Selection
Table 1 - Indirect Access Register
Control Register
Read/Write Data Register
Address High Register
Address Low Register
Zarlink Semiconductor Inc.
cpu_ale
cpu_ale
cpu_ale
cpu_ale
cpu_ale
cpu_ale
cpu_ale
cpu_ale
ALE
a
cpu_a[14:0]
(word address)
cpu_d[15:1]
(word address)
cpu_a[14:0]
(byte address)
cpu_d[7:0]
(byte address)
(word address)
cpu_a[15:1]
(word address)
cpu_a[14:0]
(byte address)
cpu_a[14:8] &
cpu_d[7:0]
(byte address)
cpu_a[14:8] &
cpu_d[14:0]
ADDRESS PIN
b
cpu_d[15:0]
cpu_d[15:0]
cpu_d[7:0]
cpu_d[7:0]
cpu_d[15:0]
cpu_d[15:0]
cpu_d[7:0]
cpu_d[7:0]
DATA PIN
MT92220
cpu_a_das
cpu_a_das
cpu_a_das
cpu_a_das
cpu_a_das
cpu_a_das
cpu_a_das
cpu_a_das
DIRECT_
ACCESS
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