CX28394/28395/28398
4.0 Electrical/Mechanical Specifications
Quad/x16/Octal—T1/E1/J1 Framers
4.5 MPU Interface Timing
Figure 4-15. Serial Control Port Read Timing
SERCS*
1
2
3
SERCKO
SERDO
SERDI
4
5
1
A0
A1
Address/Command
Byte
D5
D6
D7
Read Data Byte
Table 4-16. Host Serial Port Timing
Symbol
Parameter
Minimum
Maximum
Units
1
2, 3
2, 3
4
SERCKO Falling Edge to SERCS* and SERDO
SERCKO Duty Cycle
10
40
—
60
ns
%
SERCKO Frequency (Programmable)
SERDI to SERCKO Rising Edge Setup Time
SERCKO Rising Edge to SERDI Hold Time
1.024
10
8.192
—
MHz
ns
5
5
—
ns
—
Rise/Fall Time (10% to 90%)
SERCKO, SERDI, SERDO
—
20
ns
100054E
Conexant
4-17
CONEXANT [ CONEXANT SYSTEMS, INC ]
