VT6516 ETC, VT6516 Datasheet - Page 57

• Manufacturer Part Number: VT6516
• Description: 16/12 PORT 10/1000 ASE T/TX
• Manufacturer: ETC

01H-
03H
04H-
07H
10H-
13H
14H-
1BH
00H
08H
09H
1CH
1DH
interrupt status register
bit 0: interrupt indication for read/write PHY command
bit 1: interrupt indication for read/write EEPROM command
bit 2: interrupt indication for CPU IO port receiving an
bit 3: interrupt indication for CPU IO port finishing the
To clear an interrupt, write 1 to the corresponding IRQSTS bit.
However, write 0 will not cause any change on that interrupt.
SRAM address register
The data object addressed is in unit of 32 bits. The maximum
allowable SRAM size is 1MB. For SRAM direct access, the CPU
has to (1) set SRAMADDR & SRAMDATA, (2) issue read/write
command by SRAMCMD, and (3) check command status by
SRAMSTS.
SRAM data register
SRAM command register
2’b00 : nop
2’b01 : read
2’b10 : write
To make a direct read to SRAM, write SRAMCMD by 2’b01. To
make a direct write to SRAM, write SRAMCMD by 2’b10.
Read/Write will cause the SRAMSTS = ”busy” immediately. As it is
done, SRAMSTS = “done”. A following read to SRAMSTS will
clear it to “idle”.
SRAM status register
2’b01 : read/write command done
2’b10 : busy (read/write in progress)
2’b00 : idle
SDRAM address register
The data object addressed is in unit of 64 bits. The maximum
allowable SDRAM size is 128MB. For SDRAM direct access, the
CPU has to (1) set SDRAMADDR & SDRAMDATA, (2) issue
read/write command by SDRAMCMD, and (3) check command
status by SDRAMSTS.
SDRAM data register
SDRAM command register
2’b00 : nop
2’b01 : read
2’b10 : write
To make a direct read to SDRAM, write SDRAMCMD by 2’b01. To
make a direct write to SDRAM, write SDRAMCMD by 2’b10.
Read/Write will cause the SDRAMSTS = ”busy” immediately. As it
is done, SDRAMSTS = “done”. A following read to SDRAMSTS
will clear it to “idle”.
SDRAM status register
2’b01 : read/write command done
2’b10 : busy (read/write in progress)
2’b00 : idle
VIA Technologies, Inc.
complete
complete or error
incoming packet
transmission of an outgoing packet
-57-
Preliminary VT6516 Datarsheet
IRQSTS
SRAMAD
DR
SRAMDA
TA
SRAMCM
D
SRAMSTS [1:0] 0
SDRAMA
DDR
SDRAMD
ATA
SDRAMC
MD
SDRAMS
TS
[3:0] 0
[18:0
]
[31:0
]
[1:0]
[23:0
]
[63:0
]
[1:0]
[1:0] 0
R/
W
R/
W
R/
W
R/
W
R/O
R/
W
R/
W
R/
W
R/O