Emerson CC1000DM user manual B.R.I.D. G. .E. .E.E. P. .R.O. M, Bridge EEPROM

3

Table 3-6:

PLX PCI 6254 Configuration Signals

P M C / P C I I N T E R F A C E

Bridge EEPROM

.B.R.I.D. G. .E. .E.E. P. .R.O. M. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

The PLX PCI 6254 PCI-to-PCI bridge utilizes ROM interface signals to initialize the PCI 6254 registers. The following table briefly describes these signals (see the data book for complete information):

Signal Description:

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

EEPCLK	The EEPROM Clock output signal to the EEPROM interface is used during
	autoload and for VPD functions. This pin is tri-stated if EE_EN* = 1.
EEPDATA	The EEPROM Serial Data interfaces to the EEPROM (bi-directional). This pin
	is tri-stated if EE_EN* = 1.
EE_EN*	The EEPROM Enable LOW input enables EEPROM access.
	0=enable EEPROM use
	1=connect to logic 1 state

Register 3-2:

PCI6254 Configuration Registers– Transparent Mode

.P.C.I. .6.2. 5. .4. .C.O. .N.F. I.G. .U.R. A. .T.I .O.N. . R. .E.G. I.S. T. .E.R.S. . . . . . . . . . . . . .

The PCI 6254 can be configured to act as either a transparent or non-transparent PCI- to-PCI bridge by selecting the appropriate jumper on JP5 (see page 2 -9). In transparent mode, the CC1000dm system PCI bus is connected to the PCI 6254 primary port. The PCI 6254 non-transparent mode acts as a memory-mapped PCI device with the primary port connected to the cPCI backplane.

Primary
Offset	31	24	23	16	15	8	7	0
00h		Device ID				Vendor ID
04h		Primary Status				Primary Command
08h			Class Code					Revision ID
0Ch		BIST	Header Type		Primary Latency Time			Cache Line Size
10h
				reserved
18h	Secondary Latency Timer		Subordinate Bus Number		Secondary Bus Number			Primary Bus Number
1Ch
		Secondary Status				I/O Limit		I/O Base
20h
		Memory Limit				Memory Base
24h
		Prefetchable Memory Limit				Prefetchable Memory Base

3-6CC1000dm User’s Manual 10004281-02