DS3134 datasheet(157/203 Pages) DALLAS

157 / 203 page

DS3134

157 of 203

PVID1

0x100

lsb

Vendor ID (Read Only / set to EAh)

Vendor ID (Read Only / set to 13h)

Device ID (Read Only / set to 34h)

msb

DeviceID (Read Only / set to 31h)

Bits 0 to 15 / Vendor ID. These read only bits identify Dallas Semiconductor as the manufacturer of the

device. The Vendor ID was assigned by the PCI Special Interest Group and is fixed at 13EAh.

Bits 16 to 31 / Device ID. These read only bits identify the DS3134 as the device being used. The

Device ID was assigned by Dallas Semiconductor and is fixed at 3134h.

PCMD1

0x104

lsb

STEPC

PARC

VGA

MWEN

SCC

MASC

MSC

IOC

Reserved (Read Only / set to all zeros)

FBBEN

PSEC

FBBCT

UDF

66 MHz

Reserved (Read Only / set to all zeros)

msb

PPE

PSE

MABT

TABTM

TABT

DTS1

DTS0

PARR

Read only bits in the PCMD1 register are indicated above by being underlined. All other bits are read-

write.

The lower word (bits 0 to 15) of the PCMD1 register is the Command portion and is used for control of

the PCI bus. When all bits in the lower word are set to zero, then the device is logically disconnected

from the bus for all accesses except for accesses to the configuration registers. The upper word (bits 16 to

31) is the Status portion and it is used for status information. Reads to the Status portion behave normally

but writes are unique in that bits can be reset (i.e. forced to zero) but not set (i.e. forced to one). A bit in

the Status portion will be reset when a one is written to that bit position. Bit positions that have a zero

written to them will not be reset.

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