
S1R72104 Technical Manual
Rev.1.1
EPSON
19
* Operational settings of the port interface
Shown below is a list of the operational settings made by the bit setting.
1) Switching master/slave of the port by PSLV bit
PDREQ
XPDACK
XPRD/XPWR
Remarks
PSLV=0
(Master)
Input
Output
Output
Data input during XPRD
Data output during XPWR
Setting of STB3 to 0 valid
XPRD/XPWR pulse width:
Assert
≥
40ns
Negate
≥
40ns
PSLV=1
(Slave)
Output
Input
Input
Data output during XPRD
Data input during XPWR
Setting of STB3 to 0 invalid
XPRD/XPWR pulse width:
Assert
≥
30ns
Negate
≥
30ns
2) Switching operational modes by BUS8/SWAP/ODS bit
BUS8=0 SWAP=0
PD7 to 0 is transferred to and from SCSI block first.
If ODS = 1, PD7 to 0 is discarded when the first one word is transferred,
and only PD15 to 8 is transferred.
PD7 to 0 is used if the last data to be transferred is not a word but a byte.
SWAP=1
PD15 to 8 is transferred to and from SCSI block first.
If ODS = 1, PD15 to 8 is discarded when the first one word is transferred,
and only PD7 to 0 is transferred.
PD15 to 8 is used if the last data to be transferred is not a word but a byte.
BUS8=1
Only PD7-0 is used for transfer.
PD15 to 8 is used for Input mode (connect to GND).
7.3.22 CONFIG1 (CONFIG1) R/W
Sets the operational mode of the IC.
7 6 5 4 3 2 1 0
NP3
NP2 NP1 NP0 AP3
AP2 AP1 AP0
1Dh
BIT7 to 4 NP3 to 0
Sets the negate pulse width of XPRD/XPWR when the port operates in Master mode.
The width is the internal operation clock cycle (40MHz) multiplied by [(NP3 to 0)+2].
ex 0000: 2
×
25ns=50ns
0001: 3
×
25ns=75ns
BIT3 to 0 AP3 to 0
Sets the assert pulse width of XPRD/XPWR when the port operates in Master mode.
The width is the internal operation clock cycle (40MHz) multiplied by [(AP3 to 0)+2].
ex 0000: 2
×
25ns
=
50ns
0001: 3
×
25ns
=
75ns