GX3246 Datasheet, PDF (37/47 Pages) Semtech Corporation – Crosspoint Switch with Trace Equalization and Output De-emphasis

4.12.1.3 APPI External Timing for Normal Read
P_CS
P_R/W
P_ADD
[11:0]
P_DAT
[15:0]
t _{SCS_r}
t _{SRW_r}
t _{SA_r}
t _DNZ
t _DO
t _{HCS_r}
t _{HRW_r}
t _{CSH_r}
t _CDZ
t _RDZ
A[11:0]
D[15:0]
t _{HA_r}
P_ADS
t _{PW_r}
Figure 4-8: External Timing for Normal Read Cycle
Table 4-15: APPI External Timing Specifications for Normal Read
Parameter
Internal read pipeline delay (0 if one-cycle read)
P_CS LOW before P_ADS negative edge
P_CS hold time after P_ADS positive edge
P_R/W HIGH before P_CS negative edge
P_R/W hold time after P_ADS positive edge
P_ADD[11:0] setup before P_ADS negative edge
P_ADD[11:0] hold after P_ADS positive edge
P_DAT[15:0] out of tristate after P_ADS negative edge
P_DAT[15:0] becomes valid after P_ADS negative edge
P_DAT[15:0] goes tristate after P_CS positive edge
P_DAT[15:0] goes tristate after P_ADS positive edge
P_ADS LOW pulse width
P_CS HIGH before next read/write cycle
Frequency for back-to-back single reads
Symbol
Equiv.
Cycles
—
1
t_{SCS_r}
—
t_{HCS_r}
—
t_{SRW_r}
—
t_{HRW_r}
—
t_{SA_r}
—
t_{HA_r}
—
t_DNZ
2
t_DO
—
t_DZ
—
t_DZ
—
t_PW
—
t_{CSH_r}
3
—
—
Min
—
5.0
5.0
1.5
5.0
0.0
0.0
14.8
—
—
—
65.0
22.2
—
Typ Max Units
—
—
—
—
—
ns
—
—
ns
—
—
ns
—
—
ns
—
—
ns
—
—
ns
—
—
ns
—
65.0
ns
—
45.0
ns
—
45.0
ns
—
—
ns
—
—
ns
—
10.29 MHz
GX3246 290 x 146 3.5Gb/s Crosspoint
Final Data Sheet Rev. 2
GENDOC-056078 March 2013
www.semtech.com
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