XRT75R12D Datasheet, PDF (53/131 Pages) Exar Corporation – TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER

PRELIMINARY
XRT75R12D
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER REV. P1.0.1
FIGURE 35. ASYNCHRONOUS µP INTERFACE SIGNALS DURING PROGRAMMED I/O READ AND WRITE OPERATIONS
Addr[7:0]
CS
D[7:0]
RD
WR
RDY
READ OPERATION
t₀
Valid Address
WRITE OPERATION
t₀
Valid Address
Valid Data for Readback
t₁
t₂
Data Available to Write Into the LIU
t₃
t₄
TABLE 14: ASYNCHRONOUS TIMING SPECIFICATIONS
SYMBOL
t₀
t₁
t₂
NA
t₃
t₄
NA
PARAMETER
Valid Address to CS Falling Edge
CS Falling Edge to RD Assert
RD Assert to RDY Assert
RD Pulse Width (t₂)
CS Falling Edge to WR Assert
WR Assert to RDY Assert
WR Pulse Width (t₄)
MIN
MAX
0
-
0
-
-
65
70
-
0
-
-
65
70
-
UNITS
ns
ns
ns
ns
ns
ns
ns
48