PPC7A Product Manual
Functional Description
8-27
1
st
Edition
RTS Register (Port 0x0826)
This register provides options for when the COMs channel data transmitters are enabled. This selection
logic only works in RS422 interface mode.
MSB = D0, LSB = D7
D0 & D1: Reserved always reads ‘0’
D2 and D3:
COM3 transmitter function select
D3 D2 T
RANSMIT
F
UNCTION
S
ELECTED
0
0
Not enabled
0
1
Enabled
1
0
Enabled by RTS3
1
1
Enabled by RTS3 & stretched
D4 & D5: Reserved always reads ‘0’
D6 and D7:
COM4 transmitter function select
D7 D6 T
RANSMIT
F
UNCTION
S
ELECTED
0
0
Not enabled
0
1
Enabled
1
0
Enabled by RTS4
1
1
Enabled by RTS4 & stretched
Watchdog Register (Port 0x0828)
This register controls the watchdog resets features of the PPC7A.
MSB = D0, LSB = D7
D0:
Last reset was a watchdog
0 = Normal reset
1 = Last board reset was caused by a watchdog timeout
D1:
Enable NMI from GT-64260
0 = Disabled
1 = NMI can be generated from GT-64260 CPUINT output pin
D2 to D5: Reserved – Reads ‘0’
D6: Watchdog
enable
0 = Trig output disabled
1 = Trig output enabled
Once the trig output is enabled the Watchdog trig register (0x082C) needs to be accessed every 1.5
seconds, or a hard reset of the entire PPC7A
occurs.
D7: RESET_SW_EN
(output)
0 = Disable the front panel reset switch logic.
1 = Enable the front panel reset switch logic.
$
Note:
This bit has no effect if the switch logic is not present or if link E14 is fitted.
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