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UPD703103A Datasheet(PDF) 36 Page - NEC

No. de Pieza. UPD703103A
Descripción  32-Bit Single-Chip Microcontrollers
Descarga  99 Pages
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Fabricante  NEC [NEC]
Página de inicio  http://www.nec.com/
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UPD703103A Datasheet(HTML) 36 Page - NEC

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CHAPTER 3 SPECIFICATIONS OF PCI HOST BRIDGE MACRO
Application Note U17121EJ1V1AN
36
3.4.2 PCI_CONFIG_ADD register
After reset: 00000000H
R/W
Offset address: 04H
31
0
CADD
Bit Name
R/W
Function
CADD
R/W
Sets PCI configuration register address of access target.
(1) How to set PCI_CONFIG_ADD register
(a) Type 0 (PCI device)
31
11 10
8
7
2
1
0
0
0
IDSEL specification
Function
number
Register number
IDSEL specification: Selects the IDSEL signal corresponding to the access target PCI device.
Because this PCI host bridge macro uses the AD31 to AD11 signals as the IDSEL
signal for each PCI device, the AD signal connected to the IDSEL pin of each PCI
device is specified in this field. For example, if the AD31 signal is connected to the
IDSEL pin of a PCI device, access is enabled by setting bit 31 of CADD to 1.
Function number:
Specifies the function number for a multifunction device.
Register number:
Specifies the number of the access target PCI configuration register.
(b) Type 1 (PCI-PCI bridge)
31
24 23
16 15
11 10
8
7
2
1
0
0
1
Bus number
Device number
Function
number
Register number
Bus number:
Specifies the number of the PCI bus connected to the access target PCI device.
Device number:
Specifies the device number of the access target PCI device.
Function number:
Specifies the function number for a multifunction device.
Register number:
Specifies the number of the access target PCI configuration register.


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