36
Test Point ID
Net Name
Function
A195
VX
isolated input from telephone @ 2V
A206
VX
scaled down vesion of A195
A218
VX
AC coupled vesion of A206 to 2.5V DC (A131)
A219
AC gnd for inverter
A230
GNDD
gnd for DAA
A205
VR
reduced amplitude version of A142
A142
VR
AC coupled version of A132 to 2V DC
A132
VR
audio signal to appear across phone lines
A169
/RVLC
mirror (reduced) of voltage across the phone line
A180
/LC
0V = offhook, 5V = onhook
A207
feedback for buffer
A117
TXD-
inverted signal for transmit to phone (not used)
A131
VREF
reference voltage (2.5V when comunicating)
A115
CF2
internal feedback integration filter
A102
CF1
internal feedback integration filter
A178
RXI-
inverted receive input
A179
RXI+
non-inverted receive inpunt
A182
feedback virtual gnd
A162
5v-AMODEM
analogue 5V
A228
GNDD
gnd
A103
EXTAL
cyrstal oscillator input: 24.576MHz
A086
XTAL
cyrstal oscillator: 24.576MHz
A078
TEST2/RCLK
0V unused input
A074
/RTS
5V unused input
A069
HD5
modem data line 5
A084
HD6
modem data line 6
A085
HD7
modem data line 7
A203
/MODEM RESET
0V = reset modem data pump IC
A100
HA0
modem address line 0
A105
HA1
modem address line 1
A101
HA2
modem address line 2
A089
/HIRQ
host interupt request
A088
/HRD
host read enable strobe
A095
/HWR
host write enable strobe
A083
HD0
modem data line 0
A076
HD1
modem data line 1
A082
/HCS
host chip select
A094
XTAL1
cyrstal oscillator input: 14.7456MHz
A099
XTAL2
cyrstal oscillator: 14.7456MHz
A073
D4
modem data line 4
A072
D3
modem data line 3
A077
D2
modem data line 2
A113
RXD
5V RS232 from mips to modem
TP900
/SHUNT
pulse dial shunt relay output (not used)
A114
TXD
5V RS232 to mips from modem
A130
RING
ring detect input
A149
voltage reference 0.65V
A148
mirror (reduced) of voltage across the phone line used to detect ringing signal
A232
OFFHOOK
parallel phone offhok detect - 1s pulse low = parallel phone offhook
A126
A233
parallel phone offhook streached pulse
A174
parallel phone offhook short pulse
A193
/OH
0V = offhook, 5V = onhook
Содержание C28W40TN
Страница 29: ...28 GENERAL BLOCK DIAGRAM ...
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Страница 299: ...Users Guide C28W40TN C32W40TN ...
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Страница 355: ...Users Guide C28W35TN C32W35TN S C R E E N S C R E E N ...