AM79C30AVC datasheet(32/101 Pages) AMD

32 / 101 page

Am79C30A/32A Data Sheet

processor that the MAP digital circuitry is functional.

Note that the digital patterns received after loopback

will not be identical to the transmitted patterns. The

D-D gain is approximately 2.5 dB.

MAP Digital Loopback 2

This loopback mode connects the analog D/A output

path to the analog A/D input path, internal to the DSC

circuit. The EAR and LS outputs and both AIN inputs

will be disabled. This mode allows verification from the

S Interface or microprocessor that the MAP analog and

digital circuitry are functional. The digital patterns re-

ceived after loopback will not be identical to the trans-

mitted patterns.

The bits in the MAP mode Register define the en-

able/disable options for the various MAP configurations

as follows.

MAP Registers

The MAP contains the programmable registers found in

Table 31.

Note:

It is necessary to complete any transfers to the multi-byte

MAP registers. For instance, a total of 16 bytes must be trans-

ferred to update the X filter.

Following reset, the MAP registers FTGR, MMR1,

MMR2, MMR3, STRA, and STRF all default to 00 hex.

All other MAP registers are not affected by reset and

must be programmed by the microprocessor before

being enabled. When the registers are disabled, or

after reset, the MAP will have the response shown in

Table 32.

Table 31.

Map Registers

MAP Register

Bytes

Mnemonic

X-filter Coefficient Register

R-filter Coefficient Register

GX-Gain Coefficient Register

GR-Gain Coefficient Register

GER-Gain Coefficient Register

GER

Sidetone-Gain Coefficient Register

STGR

Frequency Tone Generator Register

FTGR

Amplitude Tone Generator Register

ATGR

MAP mode Registers (3)

MMR

Secondary Tone Ringer Amplitude

Reg

STRA

Secondary Tone Ringer Frequency

Reg

STRF

Transmit Peak Register

PEAKX

Receive Peak Register

PEAKR

Table 32.

Default Values

Filter

Default Response

X filter

Disabled (0 dB, Flat)

R filter

Disabled (0 dB, Flat)

GX filter

Disabled (0 dB, Gain)

GR filter

Disabled (0 dB, Gain)

GER filter

Disabled (0 dB, Gain)

Sidetone gain

Disabled (–18 dB, Gain)

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