Sundance Spas ST201 User Manual
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45
Sundance Technology
ST201
PRELIMINARY draft 2
ASICCTRL
Class....................I/O Registers, Control and Status
Base Address ......IoBaseAddress register value
Address Offset .....0x30
Access Mode .......Read/Write
Width ...................32 bits
AsicCtrl provides chip-specific, non-host-related settings. The contents of the least significant byte of Asic-
Ctrl are read from EEPROM at reset.
BIT
BIT NAME
BIT DESCRIPTION
0
Reserved
Reserved for future use. Should be set to 0.
1
ExpRomSize
Specifies the size of the Expansion ROM installed on the adapter, as
follows:
0 = 32 kB (default after reset)
1 = 64 kB
2
TxLargeEnable
This read/write bit, when set, enables transmission of frames that are
larger than the TxFIFO. Since ST201’s TxFIFO size is 2KB, this bit can
be left clear (the reset default).
3
RxLargeEnable
This read/write bit, when set, enables reception of frames that are
larger than the RxFIFO. Since ST201’s RxFIFO size is 2KB, this bit
can be left clear (the reset default).
4
ExpRomDisable
This bit, when set, disables accesses to the on-adapter Expansion
ROM. This bit is included to allow bypassing the Expansion ROM with-
out having to physically remove it from the board. When this bit is set,
the ST201 responds to any read in its configured Expansion ROM
space by returning 00000000h, and it ignores writes to the Expansion
ROM. This bit resets to 0.
5
PhySpeed10
This read-only bit, when set, indicates the 10Mb/s operation is avail-
able from the PHY on the adapter. “0” indicates the PHY is not 10Mb/s
capable.
6
PhySpeed100
This read-only bit, when set, indicates the 100Mb/s operation is avail-
able from the PHY on the adapter. “0” indicates the PHY is not 100Mb/
s capable.
7
PhyMedia
This read-only bit indicates the media type that is available on the
adapter. “0” indicates twisted-pair media, and “1” indicates fiber media.
The combination of PhyMedia, PhySpeed100, and PhySpeed10 will
determine the capability of the adapter. For example, [7,6,5] =
000: undefined
001: 10BASE-T PHY
010: 100BASE-T PHY
011: 10BASE-T and 100BASE-T dual-speed PHY
100: undefined
101: 10BASE-F PHY
110: 100BASE-F PHY
111: 10BASE-F and 100BASE-F dual-speed PHY