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HighWire HW400c/2 User Reference Guide Rev 1.0
4.2.10 PCI Status Register (PSR)
The PCI Status Register (PSR) is a Read-Only register and indicates the status of
host and local PCI buses. The bits of this register are defined as follo
the
ws.
Table 39. PCI Status Register (PSR) Offset Address 0x0F
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
R R R R eserved eserved eserved LPCI2 LPCI1 LPCI0 eserved NOPCI
LPCI = 0 Local PCI Bus running in PCI mode
1 ocal PCI Bus running in PCI-X mode
PCI[1:0] = 00 Local PCI Bus running at 33 MHz
= 01 Local PCI Bus running at 66 MHz
= 10 Local PCI Bus running at 100 MHz
us running at 133 MHz
4.2.11 Extended
he Extended Type Register (ETR) is a Read-Only register that indicates the type of
ster (BOR)
is set to “111”. The ETR[2:0] bits are permanently set to “111”, while ETR[7:3]
represents the board type.
Table 40. Extended Type Register (ETR) Offset Address 0x10
Bit 7 Bit 6
= L
L
= 11 Local PCI B
NOPCI = 0 Host PCI Bus is present (cPCI backplane has PCI)
= 1 No Host PCI bus on cPCI backplane
Type Register (ETR)
T
board. It is only used in the case when bits 0-2 in the Board Option Regi
Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
ETR7 ETR6 ETR5 ETR4 ETR3 1 1 1
ETR[7:3] = 00000 HW400c/2 Standard Version
= 00001 Reserved for future versions
= 00010 Reserved for future versions
October 10, 2006 Copyright 2006, SBE, Inc. Page 53