PC87382 datasheet(19/72 Pages) NSC

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3.0 Device Architecture and Configuration (Continued)

Revision 1.2

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Table 6. BADDR Strapping Options

The Index register is an 8-bit read/write register located at the selected base address (Base+0). It is used as a pointer to the

configuration register file, and holds the index of the configuration register that is currently accessible via the Data register.

Reading the Index register returns the last value written to it (or the default of 00h after reset).

The Data register is an 8-bit register (Base+1) used as a data path to any configuration register. Accessing the Data register

actually accesses the configuration register that is currently pointed to by the Index register.

3.2.2

Banked Logical Device Registers Structure

Each functional block is associated with a Logical Device Number (LDN). The configuration registers are grouped into banks,

where each bank holds the standard configuration registers of the corresponding logical device. Table 7 shows the LDN val-

ues of the PC87382 functional blocks. Any value not listed is reserved.

Figure 4 shows the structure of the standard configuration register file. The LDN and PC87382 configuration registers are

not banked and are accessed by the Index-Data register pair only, as described in Section 3.2.1. However, the device control

and device configuration registers are duplicated over four banks for four logical devices. Therefore, accessing a specific

register in a specific bank is performed by two-dimensional indexing, where the LDN register selects the bank (or logical

device) and the Index register selects the register within the bank. Accessing the Data register while the Index register holds

a value of 30h or higher physically accesses the logical device configuration registers currently pointed to by the Index reg-

ister, within the logical device currently selected by the LDN register.

Figure 4. Structure of Standard Conﬁguration Register File

Table 7. Logical Device Number (LDN) Assignments

BADDR

I/O Address

Index Register

Data Register

2Eh

2Fh

1 (default)

164Eh

164Fh

LDN

Functional Block

02h

Infrared (IR)

03h

Serial Port 1 (SP1)

07h

General-Purpose I/O (GPIO) Ports

19h

Docking LPC Switch

07h

20h

30h

60h

75h

FFh

Logical Device Number Register

SuperI/O Configuration Registers

Logical Device Control Register

Standard Logical Device

Special (Vendor-defined)

Configuration Registers

Banks

2Fh

F0h

Bank Select

63h

74h

70h

71h

Configuration Registers

(One per Logical Device)

Logical Device

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