MT9196

Preliminary Information

7-148

ADDRESS = 16h RESERVED

Note: Bits marked "-" are reserved bits and should be written with logic "0".

C-Channel Register

ADDRESS = 14h WRITE/READ

Power Reset Value

1111 1111

76543210

B7

B6

B5

B4

B2

B1

B0

B3

Micro-port access to the ST-BUS C-Channel information

D-Channel Register

ADDRESS = 15h WRITE/READ

Power Reset Value

1111 1111

76543210

D7

D6

D5

D4

D2

D1

D0

D3

Loop1

When high, the selected B-channel in ST-BUS mode (i.e., B2/B1 and Transmit and Receive Path selections) or the strobed

B-channel in SSI mode is looped back from Din to Dout through the FDI block. The C & D channels (ST-BUS mode) are not

looped back. When low, the device operates normally.

Loop2

When high, Loop1 is invoked with the transmit and receive digital gain adjustment being included. This loopback should only

be used if PCM resides in the B-channel. If a data pattern is being looped back then use Loop1 or use Loop2 after ensuring

that the transmit and receive digital gain registers are set to 0dB (address 19h). When low, the device operates normally.

Notes:

1)

do not enable Loop1 and Loop2 simultaneously.

2)

both loopback modes add an extra frame delay to the data transmission.

3)

ensure that all other bits of address 17h are written logic low when accessing this register.

Loopback Register

ADDRESS = 17h WRITE/READ VERIFY

Power Reset Value

XX00 XXXX

76543210

--

Loop2

Loop1

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-