Epson Research and Development
Page 29
Vancouver Design Center
Hardware Functional Specification
S1D13704
Issue Date: 01/02/08
X26A-A-001-04
Note
CKIO may be turned off (held low) between accesses - see Section 13.5, “Turning Off
BCLK Between Accesses” on page 86
Table 7-2: SH-3 Bus Timing
Symbol
Parameter
Min
Max
a
a
One Software WAIT State Required
Units
f
CKIO
Bus Clock frequency
0
50
MHz
T
CKIO
Bus Clock period
1/f
CKIO
t2
Clock pulse width high
17
ns
t3
Clock pulse width low
16
ns
t4
A[15:0], RD/WR# setup to CKIO
0
ns
t5
A[15:0], RD/WR# hold from CS#
0
ns
t6
BS# setup
5
ns
t7
BS# hold
5
ns
t8
CSn# setup
0
ns
t9
Falling edge RD# to DB[15:0] driven
25
ns
t10
Rising edge CSn# to WAIT# high impedance
10
ns
t11
Falling edge CSn# to WAIT# driven
15
ns
t12
CKIO to WAIT# delay
20
ns
t13
DB[15:0] setup to 2
nd
CKIO after BS# (write cycle)
0
ns
t14
DB[15:0] hold from rising edge of WEn# (write cycle)
0
ns
t15
DB[15:0] valid to RDY# falling edge setup time (read cycle)
0
ns
t16
Rising edge RD# to DB[15:0] high impedance (read cycle)
10
ns
*