Toshiba e-STUDIO170F Service Manual page 280

• ASIC (I/O port: IC38) Signal Table
Pin No.
1, 25, 41, 52, 61 VDD
2-9 D[0]-[7]
10, 34, 42, 46, 51, VSS
56, 60, 71
11 IOPTX
12 HIOWX
13 HIORX
14-16 A[1]-[3]
17 HSWC0
18 DDETO
19 CIREQ
20 HSWC3
21 PWRSVREQ
22 HSWC5
23 HSWC6
24 HSWC7
26-28 SPVOL0-2
29 RING/TONE
30 MDM1RESX
31 TONESEL
32, 33 HSWS6, 7
35 CISXO
36 REVAO
37 REVBO
38 HOOKO
39 EXTHK
40 HSER5
43 LEDBLK
44 PWRSVACK
45 PRTRESX
47 CPRDYX
e-STUDIO170F Circuit Description
Signal name I/O
-
I/O
-
I
I
I
I
-
I
I
-
I
-
-
-
O
O
O
O
-
I
I
I
I
I
-
O
O
O
O
+5V
Data bus
Signal ground
ASIC (I/O port) chip select signal (Low-active)
Selects the ASIC (I/O port).
I/O write signal (Low-active)
Writes data to each IC and I/O device.
I/O read signal (Low-active)
Reads data into each IC and I/O device.
Address bus
Pull-down: signal ground
Document detect signal (Low-active)
Detects the presence or absence of a document.
CI request signal (Low-active)
Indicates that the Sub-CPU (IC56) has detected the CI
signal.
Pull-down: signal ground
Super power save request signal (Low-active)
Requests the Sub-CPU to move to the Super Power
Save mode.
Pull-down: signal ground
Pull-down: signal ground
Pull-up: +5V
Speaker volume control signal
Controls the volume of the speaker.
Ring/tone select signal (H: Pseudo ring, L: Tone)
Selects the signal to be output from the speaker.
MODEM reset signal (Low-active)
Resets the MODEM (IC53).
Line/tone select signal (H: Line monitor, L: Ring or
tone)
Selects the signal to be output from the speaker.
Not used (Open)
CI detect signal (L: Detected)
Detects the ring signal sent from the contacted commu-
nication station.
Line current detect signal
Detect current flowing through the line.
Current reverse line current detect signal
Detect current flowing through the line.
Hook detect signal (H: On-hook, L: Off-hook)
Detects the hook status of the handset.
External TEL hook detect signal (H: On-hook, L: Off-
hook)
Detects the hook status of the external TEL.
Pull-down: signal ground
Power save LED blinking signal
Requests the Sub-CPU to blink the power save LED.
Power save acknowledge signal (Low-active)
Enables the Sub-CPU to move to the Super Power
Save mode.
Printer reset signal (Low-active)
Resets the Engine-CPU.
Controller power ready signal (Low-active)
The ASIC (I/O port) indicates to the Engine-CPU that
sending and receiving of signals is ready.
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Function
January 2005 © TOSHIBA TEC