4.0 Electrical/Mechanical Specifications
CX28394/28395/28398
4.5 MPU Interface Timing
Quad/x16/Octal—T1/E1/J1 Framers
Figure 4-9. Motorola Synchronous Read Cycle
MOTO* = 0, SYNCMD = 1
MCLK
1
AS*
9
2
A[8:0]
CS*
Address
3
4
5
DTACK*
R/W*
6
DS*
7
8
Read Data
AD[7:0]
Table 4-12. Motorola Synchronous Read Cycle
Symbol
Parameter
AS* high pulse width
Minimum
Maximum
Units
1
2
3
4
5
6
7
8
9
15
2
—
ns
ns
ns
ns
ns
ns
ns
ns
ns
A[8:0] Address setup to AS* low
A[8:0] Address hold after AS* low
AS* and CS* low to DTACK* low
AS* or CS* high to DTACK* high
AS*, DS*, CS*, R/W* setup to MCLK high
DS* sampled low to AD[7:0] valid
CS* or DS* high to AD[7:0] invalid/three-state
MCLK high to AS* high
—
2
—
0
10
0
10
15
—
0
—
0.5/MCLK +20
30
—
1/MCLK + 12
4-12
Conexant
100054E
CONEXANT [ CONEXANT SYSTEMS, INC ]
