GX3290 Datasheet, PDF (35/47 Pages) Semtech Corporation – 290 x 290 3.5Gb/s Crosspoint Switch

Table 4-12: APPI Inputs/Outputs
Signal Name
P_CS
P_ADS
P_R/W
P_ADD[11:0]
P_DAT[15:0]
I/O Description
I
Chip Select from the host.
Address/Data Strobe from the host; used to “clock” address
I
and write data into the chip, and to “clock” read data out of
the chip.
I
Read/Write indication from the host; HIGH for read, LOW for
write.
I
Address from the host.
I/O
Write data from the host, or read data to the host.
4.12.1.1 APPI External Timing for Normal Write
P_CS
P_R/W
P_ADD
[11:0]
t SR W_w
P_DAT
[15:0]
t _{SC S_w}
t _{H C S_w}
t _{CSH_w}
A[11:0]
t _{SA_w}
D[15:0]
t _{SD_w}
t _{HRW_w}
t _{HA_w}
t _{H D_w}
P_ADS
t _{PW_w}
Figure 4-6: External Timing for Normal Write Cycle
Table 4-13: APPI External Timing Specifications for Normal Write
Parameter
P_CS LOW before P_ADS positive edge
P_CS hold time after P_ADS positive edge
P_R/W low before P_CS negative edge
P_R/W hold time after P_ADS positive edge
P_ADD[11:0] setup before P_ADS positive edge
P_ADD[11:0] hold after P_ADS positive edge
P_DAT[15:0] setup before P_ADS positive edge
P_DAT[15:0] hold after P_ADS positive edge
P_ADS LOW pulse width
Symbol
t_{SCS_w}
t_{HCS_w}
t_{SRW_w}
t_{HRW_w}
t_{SA_w}
t_{HA_w}
t_{SD_w}
t_{HD_w}
t_{PW_w}
Equiv.
Cycles
—
2
—
2
—
—
—
—
0.6
Min
10.0
14.8
1.5
14.8
10.0
5.0
5.0
5.0
4.4
Typ Max Units
—
—
ns
—
—
ns
—
—
ns
—
—
ns
—
—
ns
—
—
ns
—
—
ns
—
—
ns
—
—
ns
GX3290 290 x 290 3.5Gb/s Crosspoint
Final Data Sheet Rev. 2
GENDOC-053317 March 2013
www.semtech.com
35 of 47
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