AM79C30AVC datasheet(49/101 Pages) AMD

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Am79C30A/32A Data Sheet

3. Inter-chip communication between devices on the

bus, for instance, data flow between the DSC circuit

MAP and an external speech encryption device.

4. Connection of multiple DLCs to the D channel, in-

cluding access arbitration. This function is referred

to as the TIC channel.

The IOM-2 Terminal mode bus consists of three IOM-2

subframes, each containing 32 bits. This 12-byte frame

is repeated at 8 kHz, resulting in an aggregate data rate

of 768 kbits/s. The frame structure is illustrated in Fig-

ure 7, and contains the following channels:

•

Two 64-kbits/s data channels, labeled B1 and B2.

•

Two device programming channels, labeled Monitor

0 and 1. Each channel has an associated pair of MX

and MR handshake bits that control data flow.

•

One 16-kbits/s D channel for signaling and data

packets.

•

Two Command/Indicate channels, labeled C/I0, and

C/I1, to provide status and command for devices

connected via the monitor channels. The Com-

mand/Indicate channel in the first IOM-2 subframe

consists of four bits, providing 16 states in each di-

rection. In the second subframe the C/I channel is 6

bits, providing 64 states in each direction.

•

Two 64-kbits/s intercommunication channels, la-

beled IC1 and IC2, to provide additional interdevice

communications bandwidth.

All data transmitted on the IOM-2 Interface via the

SBOUT pin is transmitted MSB first, with the exception

of D-channel data, which is transmitted LSB first. The

receiver operates in a compatible way via the SBIN pin.

SCLK

192 kHz

SBIN or

SBOUT

SFS

41.7 µs

52 µs

LSB

MSB

125 µs

D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

Figure 5.

Serial Bus Port Mode Timing

09893H-6

Note:

SBIN is sampled on the rising edge of SCLK. SBOUT is changed on the falling edge of SCLK.

SFS

SBIN/

MR,MX

IOM channel 0

Figure 6.

IOM-2 Terminal Mode Frame Structure

09893H-7

MR,MX

IOM channel 2

IOM channel 1

SBOUT

MON0 D C/I

IC1

IC2

MON1

C/I

TIC

AM79C30AVC Datasheet(PDF) 49 Page - Advanced Micro Devices

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