
2004 Mar 16
177
Philips Semiconductors
Product specification
PC-CODEC
SAA7108E; SAA7109E
Table 203
I port I/O enable, output clock and gated clock phase control; global set 87H[7:4]; note 1
Notes
1.
2.
X = don’t care.
IPCK3 and IPCK2 only affects the gated clock (subaddress 80H, bit ICKS2 = 1).
Table 204
I port I/O enable, output clock and gated clock phase control; global set 87H[1:0]
OUTPUT CLOCK AND GATED CLOCK PHASE CONTROL
CONTROL BITS 7 TO 4
IPCK3
(2)
IPCK2
(2)
IPCK1
IPCK0
ICLK default output phase
ICLK phase shifted by
1
2
clock cycle
recommended for ICKS1 = 1
and ICKS0 = 0 (subaddress 80H)
ICLK phase shifted by about 3 ns
ICLK phase shifted by
1
2
clock cycle + approximately
3 ns
alternatively to setting ‘01’
IDQ = gated clock default output phase
IDQ = gated clock phase shifted by
1
2
clock cycle
recommended
for gated clock output
IDQ = gated clock phase shifted by approximately 3 ns
IDQ = gated clock phase shifted by
1
2
clock cycle + approximately
3 ns
alternatively to setting ‘01’
X
X
X
X
0
0
0
1
X
X
X
X
1
1
0
1
0
0
0
1
X
X
X
X
1
1
0
1
X
X
X
X
I PORT I/O ENABLE
CONTROL BITS 1 AND 0
IPE1
IPE0
I port output is disabled by software
I port output is enabled by software
I port output is enabled by pin ITRI at logic 0
I port output is enabled by pin ITRI at logic 1
0
0
1
1
0
1
0
1