Bcsr4 Board Control-Status Register 4 - Freescale Semiconductor MPC8272ADS User Manual

Board Control and Status Register - BCSR
BIT MNEMONIC
7 PCI_MODE
8-31 Reserved
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
described in Table 5-17
BIT MNEMONIC
0 - 1 PCI0_PRSNT(0:1)
2 - 3 PCI1_PRSNT(0:1)
4 - 5 PCI2_PRSNT(0:1)
6 M66EN
7 PCI_MODCK
8-31 Reserved
PCIx_PRSNT (0:1) [Hex]
1
Provided that BCSR is not disabled.
Table 5-16. BCSR3 Description (continued)
PCI_MODE. When asserted (low) the Local Bus function is set to PCI.
When negated (high), the Local Bus is set for Local Bus SDRAM.
un-implemented
Table 5-17. BCSR4 Description
PCI Slot 0 Present (0:1). This field holds a code that tells whether a PCI
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
PCI Slot 1 Present (0:1). This field holds a code that tells whether a PCI
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
PCI Slot 2 Present (0:1). This field holds a code that tells whether a PCI
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
66MHz Enable. This field shows if one of the expansion boards used is not
capable of operating in 66MHz mode:
'1' - All expansion boards are 66MHz capable
'0' - One of the expansion boards is not 66MHz capable
PCI_MODCK. This field shows the PCI bus clock settings.
un-implemented
Table 5-18. PCI Board Present Signal Definitions
0
1
MPC8272ADS User Guide
Function
1
. BCSR4s' various fields are
Function
Expansion Configuration
Expansion board present, 7.5W maximum
Expansion board present, 25W maximum
PON
ATT.
DEF
R
PON
ATT.
DEF
11 R
11 R
11 R
1 R
- R