GC5016 datasheet(80/88 Pages) TI

80 / 88 page

GC5016

SLWS142G − JANUARY 2003 − REVISED NOVEMBER 2005

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17.20 General Timer

Table 67. General Timer Page 0xA1 Address 0x11

Rcv

FIELD

BITS

Dflt

DESCRIPTION

gen_timer

15..0

65535

General-purpose timer. A 24-bit counter. The bottom eight bits of the count value are normally

assumed to be zero. Timer counts down from 256 x (gen_timer + 1) to zero, then repeats. The

timer starts over with every sync, provides ramp data for receive testing, and outputs a pulse at

restart plus five clocks.

Table 68. Receive Syncs Page 0xA1 Address 0x12

Rcv

FIELD

BITS

Dflt

DESCRIPTION

rinf_zpad

3..0

Receive input formatter zero pad count. Effectively interpolates by (rinf_zpad+1) up to the

CK rate.

rinf_diag

5..4

Receive diagnostic test pattern ramp (0), 0 (1), random (2), constant 0x4000 (3).

gen_timer_test

Shorten gen_timer for test (1) (bottom 8 bits are forced high). Normally 0.

gen_timer_sync

9..7

Sync control for general timer

cksum_sync_front

12..10

Sync control for receive input pattern generator and transmit check sum.

rinf_zpad_sync

15..13

Sync control for receive zero padding

17.21 Transmit Output

Table 69. Transmit Output Multiplexing Page 0xA1 Address 0x13

Rcv

FIELD

Bits

Dflt

Description

toutf_hold_sync

2..0

Sync control for transmit output hold

toutf_do

8..4

Transmit output format control for DO. quiet (0), id (1), qb (2), ib LSB’s (4), qa LSB’s (8), CO

complement (16). Others illegal.

toutf_co

11..9

Transmit output format control for CO. quiet (0), ic (1), ib (2), qa (4).

toutf_bo

15..12

Transmit output format control for BO. quiet (0), ib (1), qa (2), LSB of ia (4), or AO

complement (8).

Table 70. Transmit Output Round and Hold Page 0xA1 Address 0x14

Rcv

FIELD

BITS

Dflt

DESCRIPTION

toutf_rnd_AB

1..0

Round transmit outputs AO, and BO to 16 (1), 14 (2), 12 (3) bits, or no round (0).

toutf_offsetbin

Offset binary format (1) or two’s complement (0). Common to all transmit outputs.

toutf_halfcmplx_AB

Time multiplex IQ data by decimating by two at output.

toutf_hold

7..5

Hold output for toutf_hold+1 clocks − effectively decimating the signal.

toutf_rnd_CD

9..8

Round transmit outputs for CO and DO to 16 (1), 14 (2), 12 (3), bits or no round (0).

toutf_quiet_CD

Quiet CD path (1) when unused.

toutf_halfcmplx_CD

Time multiplex IQ for channels C and D.

toutf_xmt_CD

Channels C and D setup in transmit (1) or receive (0).

toutf_sumin

CO and DO setup as inputs for sumin (1), or outputs (0).

toutf_xmt_AB

Channels A and B setup in transmit (1) or receive (0).

Table 71. Transmit Checksum Page 0xA1 Address 0x15

Rcv

FIELD

BITS

Dflt

DESCRIPTION

−

transmit_cksum

15..0

Checksum results for transmit (read only)

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