PC87365 datasheet(33/215 Pages) NSC

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2.0 Device Architecture and Configuration (Continued)

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2.2.2

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 6 shows the LDN

values of the PC87365 functional blocks.

Figure 2 shows the structure of the standard configuration register file. The SuperI/O control and configuration registers are

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

device configuration registers are duplicated over 13 banks for 13 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 results in a physical access to the Logical Device Configuration registers currently pointed to by the Index

Figure 2. Structure of the Standard Conﬁguration Register File

Table 6. Logical Device Number (LDN) Assignments

Write accesses to unimplemented registers (i.e., accessing the Data register while the Index register points to a non-existing

returns 04h (indicating no DMA channel is active). The configuration registers are accessible immediately after reset.

LDN

Functional Block

00h

Floppy Disk Controller (FDC)

01h

Parallel Port (PP)

02h

Serial Port 2 with IR (SP2)

03h

Serial Port 1 (SP1)

04h

System Wake-Up Control (SWC)

05h

Keyboard and Mouse Controller (KBC) - Mouse interface

06h

Keyboard and Mouse Controller (KBC) - Keyboard interface

07h

General-Purpose I/O (GPIO) Ports

08h

ACCESS.bus Interface (ACB)

09h

Fan Speed Control and Monitor (FSCM)

0Ah

WATCHDOG Timer (WDT)

0Dh

Voltage Level Monitor (VLM)

0Eh

Temperature Sensor (TMS)

07h

20h

30h

60h

75h

FEh

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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