S1R72105 Technical Manual
4
EPSON
Rev.1.0
5. PIN DESCRIPTION
The control signal with “X” at the head of a pin name is LOW-active.
Pin No.
Symbol
I/O
Functional description
Remarks
SCSI interface-related matters (18)
99 XSDB0
97 XSDB1
95 XSDB2
93 XSDB3
91 XSDB4
89 XSDB5
87 XSDB6
85 XSDB7
SCSI data signal (SD0 to SD7)
Drive capability 48mA
83 XSDBP
Is/Otr
SCSI data parity signal
Drive capability 48mA
81
XSATN
I/Ood SCSI ATN signal
Drive capability 48mA
80
XSBSY
I/Ood SCSI BSY signal
Drive capability 48mA
78
XSACK
Is/Otr SCSI ACK signal
Drive capability 48mA
74
XSRST
I/Ood SCSI RST signal
Drive capability 48mA
73
XSMSG
I/Ood SCSI MSG signal
Drive capability 48mA
71
XSSEL
I/Ood SCSI SEL signal
Drive capability 48mA
70
XSCD
I/Ood SCSI C/D signal
Drive capability 48mA
68
XSREQ
Is/Otr SCSI REQ signal
Drive capability 48mA
66
XSIO
I/Ood SCSI I/O signal
Drive capability 48mA
USB interface-related matters (5)
2
DM
I/O
USB data port
3
DP
I/O
USB data port
(Configure to pull up to 3.3V by a 1.5k
Ω
resistor externally.
The register can be controlled by “XPUENB.”)
5
XPUENB
Ood Control signal connecting a 1.5k
Ω
pull-up resistor to “DP”
pin Ood.
V
BUS
= 5V and HIGH EnPullUp(USBCommon_b1) brings
about LOW output.
Drive capability 6mA
6 V
BUS
Is
USB bus power detection input (Pull down externally).
7
XUSBOE
O
LOW output while this IC outputs a signal to DP and DM
pins.
Drive capability 3mA
Port interface-related matters (20)
35
XPRD
Is/O Port read signal
Drive capability 3mA
36
XPWR
Is/O Port write signal
Drive capability 3mA
37
PDREQ
Is/O Port DMA request signal (also operable in negative logic)
Drive capability 6mA
34
XPDACK
Is/O Port DMA ACK signal
Drive capability 3mA
40 PD0
42 PD1
45 PD2
47 PD3
49 PD4
53 PD5
55 PD6
57 PD7
56 PD8
54 PD9
52 PD10
48 PD11
46 PD12
43 PD13
41 PD14
39 PD15
I/O
Port DMA data bus signal (PD0 to 15)
Drive capability 3mA