com90c66 Standard Microsystems Corp., com90c66 Datasheet - Page 49

• Manufacturer Part Number: com90c66
• Description: Arcnet Controller/transceiver With At Interface And On-chip Ram Corporation
• Manufacturer: Standard Microsystems Corp.

nMEMR,
nMEMW,
nIOR, or
nIOW
nOWS**
IOCHRDY**
* 1.2 uS for back-to-back 8-bit cycles
** These signals are mutually exclusive. Only one signal is active on any given board, depending
on the WAIT STATE bit of the Configuration Register.
t1
t2
t3
t4
t5
t5
2.5 uS for 16-bit cycles
The AC parameters in Figures 14-26 are preliminary. Enhancements will follow.
Control Signal Pulse Width
Control Signal Low to nOWS Low
Control Signal High to nOWS High
Control Signal Low to IOCHRDY Low
IOCHRDY Low Pulse Width
FIGURE 14 - ZERO WAIT STATE AND IOCHRDY TIMING
Parameter
t4
t2
TIMING DIAGRAMS
t5
49
t1
min
80
50
50
0
0
0
typ
max
115
115
20
20
20
*
t3
units
nS
nS
nS
nS
nS