Specifications

WA_DEV_FEX20_PTS_004 Rev 001 June 30, 2010 30
Expansion Card Product Technical
Specification
Interfaces
Table 20: PCM AC Characteristics
Signal
Description
Minimum
Typical
Maximum
Unit
Tsync_low +
Tsync_high
PCM-SYNC period
125
µs
Tsync_low
PCM-SYNC low time
93
µs
Tsync_high
PCM-SYNC high time
32
µs
TSYNC-CLK
PCM-SYNC to PCM-CLK time
-154
ns
TCLK-cycle
PCM-CLK period
1302
ns
TIN-setup
PCM-IN setup time
50
ns
TIN-hold
PCM-IN hold time
50
ns
TOUT-delay
PCM-OUT delay time
20
ns
4.7.2. Pin Description
Refer to the following table for the pin description of the PCM interface.
Table 21: PCM Pin Description
Pin Number
Signal
I/O
I/O Type
Reset State
Description
36
PCM-SYNC
O
1V8
Pull-down
Frame synchronization 8Khz
38
PCM-CLK
O
1V8
Pull-down
Data clock
39
PCM-OUT
O
1V8
Pull-up
Data output
37
PCM-IN
I
1V8
Pull-up
Data input
Refer to section 4.2 Electrical Information for Digital I/O for open drain, 2V8 and 1V8 voltage
characteristics and reset state definitions.