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Board Control and Status Register - BCSR
Table 5-16. BCSR3 Description (continued)
BIT
7
MNEMONIC
PCI_MODE
Function
PCI_MODE . When asserted ( low ) the Local Bus function is set to PCI.
PON
DEF
ATT.
R
When negated ( high ), the Local Bus is set for Local Bus SDRAM.
8-31
Reserved
un-implemented
1
Required for voltage levels adaptation.
5.11.5 BCSR4 Board Control—Status Register 4
BCSR4 is a status register which is accessed at offset 0x10 from the BCSR base address.
Its a read- only register which may be read at any time 1 . BCSR4s’ various fields are
described in Table 5-17
Table 5-17. BCSR4 Description
BIT
0-1
MNEMONIC
PCI0_PRSNT(0:1)
Function
PCI Slot 0 Present (0:1) . This field holds a code that tells whether a PCI
PON
DEF
11
ATT.
R
expansion board is plugged in PCI slot 0 and the total power requirements
of the board according to the PCI spec. The different expansion board types
are listed in Table 5-18
2-3
PCI1_PRSNT(0:1)
PCI Slot 1 Present (0:1) . This field holds a code that tells whether a PCI
11
R
expansion board is plugged in PCI slot 1 and the total power requirements
of the board according to the PCI spec. The different expansion board types
are listed in Table 5-18
4-5
PCI2_PRSNT(0:1)
PCI Slot 2 Present (0:1) . This field holds a code that tells whether a PCI
11
R
expansion board is plunged in PCI slot 2 and the total power requirements
of the board according to the PCI spec. The different expansion board types
are listed in Table 5-18
6
M66EN
66MHz Enable . This field shows if one of the expansion boards used is not
1
R
capable of operating in 66MHz mode:
‘1’ - All expansion boards are 66MHz capable
‘0’ - One of the expansion boards is not 66MHz capable
7
8-31
PCI_MODCK
Reserved
PCI_MODCK. This field shows the PCI bus clock settings.
un-implemented
-
R
Table 5-18. PCI Board Present Signal Definitions
PCIx_PRSNT (0:1) [Hex]
0
1
Expansion Configuration
Expansion board present, 7.5W maximum
Expansion board present, 25W maximum
1 Provided
that BCSR is not disabled.
MPC8272ADS User Guide
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