Texas Instruments 990 Maintenance Manual page 48

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945408-9701
Table 5-2. Baud Rate Clock Signals
Signal Location
Pulse Width
Period
OSCLK
Ul0-6 125 nsec
250 nsec
MOD13CRY
U4-15 125 nsec
1.75
µsec
DATACLK
U3-14 1.75 µsec
3.5 µsec
(9600 BAUD)
DATACLK
U3-13 3.5
µsec 7
µsec
(4800 BAUD)
DATACLK
U3-12
7 µsec 14
µsec
(2400 BAUD)
DATACLK
U3-11 14
µsec 28
µsec
(1200 BAUD)
MODllCRY U3-15
1.75 µsec 28
µsec
(ALL OTHER)
MODllCRY
U3-15 1.75 µsec
21
µsec
(110 BAUD)
DATACLK U2-13
56
µsec 114 µsec
(300 BAUD)
DATACLK
U2-11
228 µsec 456
µsec
(110 BAUD)
41
Digital Systems Division