Akai MPC4000

SERVICE MANUAL
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1-6. IC8 XC95144XL-7TQ100C (Complex programable logic (CPLD).
Address decoder.
Expansion port by using data-latch.
Communication logic for RTC.
Selector.
1-6-2. Pin Descriptions
Signal name Dir Explanation
D[7:0] i/o Connected with CPU data bus for communication.
A[24:21] in Connected with CPU address bus for communication.
/CS[5:0] in Chip select for other device.
/RD in Data output enable of CPU data bus.
/WR in Data strobe of CPU data bus.
/RESET in For initializing logic. Active low.
/GWR,/FWR out buffered /WR. (= /WR)
/GDB out Gate of buffer for logic on CPU board.
/GDB2 out Gate of buffer for logic except for CPU board.
ROMCARD in ROM card. L: not inserted (normal), H: inserted.
/FLASH_CS out Chip select for Flash-ROM. /CS0 OR (A24 XOR ROMCARD).
/ROM_CS out Chip select for ROM-card. /CS0 OR (/A24 XOR ROMCARD).
/SCSI_CS out Chip select for SCSI controller. /CS5 OR A24.
/USBF_CS out Chip select for USB host controller. /CS5 OR /A24.
FPCCLK out FPGA configuration clock on CPU PCB.
/EB_CS out Chip select for DSP on effect PCB.
FP2_CCLK out FPGA configuration clock on ADAT PCB.
/ADAT_CS out Chip select for FPGA on ADAT PCB.
/SMPTE_CS out Chip select for controller on SMPTE PCB.
/DIO_CS out Chip select for CPLD on DIO PIB.
/LSI_RESET out Reset Voice-LSI. Active low.
/VO_PLLRST out Reset PLL of Voice-LSI. Active low.
/IDE_RESET out Reset IDE.
/ADAT_INIT out Initialize FPGA and IC on ADAT PCB. Active low.
/EB_RESET out Reset DSP on effect PCB. Active low.
VO_SIN[1:0] out Audio serial data to Voice-LSI’s SIN[1:0]
AD_DATA in Analog-in audio data from CODEC (A/D at MPC).
DIO_RCVD in Digital-in audio data from DIO PCB.
ADAT_RCVD in ADAT-in audio data from ADAT PCB.
EB_RTN[3:2] out Effect return.
/SCSI_TERM out SCSI termination. H:off, L:on.
/ADA_CS out Chip select for CODEC (A/D conv. at MPC).
/ADA_PD out /PD of CODEC and A/D on MPC.
AD_DFS out DFS of a/d converter on MPC.
DA_CCLK out Control clock for CODEC (D/A conv. at MPC).
/DA_CS out Chip select for dD/A converter at MPC.
/DA_PD out /PD of D/a converter’s on MPC and DIO.
/AD_CDSEL out Select analog-out of CD player at MPC.
MUTE out For mute circuit. H: mute on, L: mute off.
LSI_MCLK in MCLK of Voice-LSI. Make synchronous reset for Voice LSI.
RTC_D[7:0] i/o RTC data bus.
RTC_AS
RTC_DS
RTC_RW out Control for RTC
/RTC_SEL
/RTC_XALM
WCKE[1:0] out Clock enable of wave SDRAM and DIMM.
SEL_XTAL0 out X2 output enable. H: enable, L: disable.
SEL_XTAL1 out X3 output enable. H: enable, L: disable.
MOTOR_ON out Control fan on MPC.