Toshiba ESTUDIO170F, Руководство по обслуживанию

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e-STUDIO170F Circuit Description January 2005 © TOSHIBA TEC
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• Sub-CPU (IC56) Signal Table
Pin No. Signal name I/O Function
1 XOUT O Sub-CPU operation clock output (4 MHz)
2 XIN I Sub-CPU operation clock input (4 MHz)
3 2WRESETX I Sub-CPU power on reset signal (Low-active)
Resets the Sub-CPU (IC56) when the power is turned
on.
4 WTOX O Sub-CPU reset signal (Low-active)
Resets the Sub-CPU.
5 LEDBLK I Power save LED blinking signal (Low-active)
The ASIC (I/O port: IC38) requests the Sub-CPU to
blink the power save LED.
6 R72 I +5VPS power up detect signal (High-active)
7 PWRSVKEY I Key input detect signal (Low-active)
Detects the press status of each key switch installed on
the Operation panel PBA.
8 DDET I Document detect signal (Low-active)
Detects the presence or absence of a document.
9 PWRSVACK I Power save acknowledge signal (Low-active)
The ASIC (I/O port) enables the Sub-CPU to move to
the Power Save mode.
10 PWRSVNACK I Power save non-acknowledge signal (Low-active)
The ASIC (I/O port) indicates return from the Power
Save mode to the Sub-CPU.
11 PWRSVLED O Power save LED lighting signal (L: Lit)
Controls the lighting of the power save LED installed on
the Operation panel PBA.
12 R51 - Not used (Open)
13 PWRSVDI O Port enable signal (Low-active)
Controls the inputs of the signals input to the NCU PBA
and the document detect signal.
14 VSS - Signal ground
15 PSC O Power save control signal (Low-active)
Limits the power supply from the LVPS in Power Save
mode.
16 HOOK I Hook detect signal (H: On-hook, L: Off-hook)
Detects the hook status of the handset.
17 CISX I CI detect signal (H: Undetected, L: Detected)
Detects the ring signal sent from the line.
18 REV I Line current detect signal
Detects the current and the reverse current flowing
through the line.
19 VBUSDET I PC interrupt signal (Low-active)
Detects the interrupt signal from the PC.
20-23 R80-83 - Pull-down: signal ground
24 R90 - Not used (Open)
25 CIREQ O CI request signal (Low-active)
Indicates the detection of CI to the ASIC (I/O port).
26 PWRSVREQ O Power save request signal (Low-active)
Requests the ASIC (I/O port) to move to the Power
Save mode.
27 KE0X/HOLDX - Pull-up: +5VPS
28 VDD - +5VPS