Specifications
EPC-6A Hardware Reference
54
Overview
Where a bit position has been described by a 0 or 1, the bit is a ROM bit, and writing to it
has no effect. Unless otherwise noted, all registers and bit values are readable and
writeable. TSEN, when set, inhibits the front panel toggle switch from generating a reset
Memory Control Register (81004h)
This register contains two control bits that pertain to the DRAM and the flash memory:
EVME If set, allows E page (0E0000h) access to and from the VMEbus. This is
necessary because the Phoenix BIOS occupies the memory region 0E0000h ~
0FFFFF at POST. When POST is complete and just before INT 19, this bit is
set to allow VME access.
Register Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 I/O port
Memory Control Register
reserved EVME CDEN 8104h
VME A21–16 Address Reg
VMEbus address bits 21–16 res res 8130h
ID Register, lower
111011008140h
ID Register, upper
100011118141h
Device Type Reg, lower
110011008142h
Device Type Reg, upper
000111118143h
Status/Control Reg, lower
SRIE RELM ARBPRI RDY PASS NOSF 8144h
Status/Control Reg, upper
SLE 1 SYSR SYSF ARBM 1 1 1 8145h
Slave Offset Reg, lower
111111118146h
Slave Offset Reg, upper
000111SLAVE BASE8147h
Protocol Register, lower
111111118148h
Protocol Register, upper
010111118149h
Response Register, lower
LOCK 1 ABMH 1 1 ULA 814Ah
Response Register, upper
00001RRDYWRDY1814Bh
Message High Reg, lower
814Ch
Message High Reg, upper
814Dh
Message Low Reg, lower
814Eh
Message Low Reg, upper
814Fh
VME Modifier Register
VME WA23–22 res IACK res AM4 AM2 AM1 8151h
VME Interrupt State Reg
IRQ7 IRQ6 IRQ5 IRQ4 IRQ3 IRQ2 IRQ1 MSGR 8152h
VME Interrupt Enable Reg
IRQ7 IRQ6 IRQ5 IRQ4 IRQ3 IRQ2 IRQ1 MSGR 8153h
VME Event State Register
1111WDTACFABERRSYSF8154h
VME Event Enable Register
1111WDTACFABERRSYSF8155h
Module Status/Control Reg
DONE AS DS0 DS1 res res FWDT ENRE 8156h
Interrupt Generator Register
11110INTERRUPT-OUT 815Fh
FSA7–0 Address Register
Flash/SRAM address bits 7–0 8380h
FS A15–8 Address Register
Flash/SRAM address bits 15–8 8381h
FS A19–16 Address Register
reserved Flash/SRAM address bits 19–16 8382h
Flash Data Register
8383h
SRAM Data Register
8384h
LED Register
TSEN LED6 LED5 LED4 LED3 LED2 LED1 LED0 8385h
Memory Control Register
reserved EVME CDEN