PCI9060ES datasheet(25/192 Pages) ETC

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SECTION 3

PCI 9080

FUNCTIONAL DESCRIPTION

©PLX Technology, Inc., 1997

Page 16

Version 1.02

3.3.3 Extra Long Serial EEPROM Load

An Extra Long Load mode is provided in the PCI 9080

(refer to Table 4-39) to load an additional five Lwords

from the serial EEPROM. If bit 25 is set to 1 in the Local

Bus Region Descriptor Register (LOC:98h) (refer to

Table 4-39), the following five Lword registers are loaded

in addition to normal Long Load process (refer to Section

3.3.2, “Long Serial EEPROM Load”). Bit 25 must be set

to 1 during the Long Load Process. (Refer to Table 3-4.)

Table

3-4.

Extra

Long

Serial

EEPROM

Load

Registers

Serial

EEPROM

Offset

Description

Subsystem ID

Subsystem Vendor ID

MSW of Range for PCI to Local Address Space 1

(1 MB)

LSW of Range for PCI to Local Address Space 1

(1 MB)

MSW of Local Base Address (Remap) for PCI

to Local Address Space 1

LSW of Local Base Address (Remap) for PCI

to Local Address Space 1

MSW of Bus Region Descriptors (Space 1) for PCI

to local accesses

LSW of Bus Region Descriptors (Space 1) for PCI

to local accesses

MSW of PCI Base Address for local expansion ROM

LSW of PCI Base Address for local expansion ROM

3.3.4 Recommended Serial EEPROMs

A 1K bit (National NM93CS46 or compatible) or 2K bit

(National NM93CS56 or compatible) device can be

used. Table 3-5 lists the recommended serial EEPROM

loads. Refer also to Table 5-2 in Section 5, “Pin

Description.”

Table 3-5. Recommended Serial EEPROM Loads

Load

Unused Bytes For

CS46 (1K)

Unused Bytes For

CS56 (2K)

Short

108

364

Long

316

Extra Long

296

Note:

PCI 9080 does not support serial EEPROMs

that do not support sequential read and write (such as

the NM93C46 or NM93C56).

3.3.5 Programming the Serial EEPROM

The serial EEPROM can be written or read, using bits

[28:24] of the Serial EEPROM Control Register (refer to

Table 4-59[28:24]).

3.4 INTERNAL REGISTER ACCESS

PCI 9080 chip provides several internal registers,

allowing for maximum flexibility in bus interface design

and performance. The register types are accessible from

both the PCI and local buses, including the following:

•

PCI configuration registers

•

Local configuration registers

•

Mailbox registers

•

Doorbell registers

•

DMA registers

•

Messaging queue registers (I2O)

Figure 3-2 illustrates how these registers are accessed.

Figure 3-2. PCI 9080 Internal Register Access

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