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Epson Research and Development Page 29
Vancouver Design Center
Hardware Functional Specification S1D13705
Issue Date: 02/02/01 X27A-A-001-10
Note
CKIO may be turned off (held low) between accesses - see Section 13.5, “Turning Off
BCLK Between Accesses” on page 84
Table 7-2: SH-3 Bus Timing
Symbol Parameter Min Max
a
a
One Software WAIT State Required
Units
f
CKIO
Bus Clock frequency
50 MHz
T
CKIO
Bus Clock period
1/f
CKIO
t2
Bus Clock pulse width low
8ns
t3
Bus Clock pulse width high
8ns
t4
A[16:0], RD/WR# setup to CKIO
0ns
t5
A[16:0], RD/WR# hold from CS#
0ns
t6
BS# setup
5ns
t7
BS# hold
5ns
t8
CSn# setup
0ns
t9
Falling edge RD# to DB[15:0] driven
25 ns
t10
CKIO to WEn#, RD# high
1.5T
CKIO
t11
Rising edge CSn# to WAIT# high impedance
10 ns
t12
Falling edge CSn# to WAIT# driven
15 ns
t13
CKIO to WAIT# delay
20 ns
t14
DB[15:0] setup to 2
nd
CKIO after BS# (write cycle)
0ns
t15
DB[15:0] hold from rising edge of WEn# (write cycle)
0ns
t16
WAIT# rising edge to DB[15:0] valid (read cycle)
6ns
t17
Rising edge RD# to DB[15:0] high impedance (read cycle)
10 ns