PC87306 datasheet(21/110 Pages) NSC

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20 Configuration Registers (Continued)

TABLE 2-4 Primary and Secondary

Drive Address Selection

Bit 5

Bit 7

Drive

PC-AT Mode

FDC

Primary

3F0–7h

FDC

Secondary

3F0–7h

IDE

Primary

1F0 – 7 3F6 3F7h

IDE

Secondary

170 – 7 376 7h

252 Function Address Register (FAR Index e 01h)

This register selects the ISA IO address range to which

each peripheral function responds See Table 2-1 for its re-

set value

Bits 01

These bits select the parallel port address as

shown in Table 2-5 and Table 2-9

TABLE 2-5 Parallel Port Addresses

PNP0 PNP0 FAR FAR

Parallel

PC-AT

Bit 4

Bit 5 Bit 1 Bit 0

Port

Interrupt

Address

LPTB (378 – 37F)

IRQ5

(Note 1)

LPTA (3BC – 3BE)

IRQ7

(Note 2)

LPTC (278 – 27F)

IRQ5

Reserved

TRI-STATE

(CTR4 e 0)

LPTB (378 – 37F)

IRQ5

(Note 2)

LTPC (278 – 27F)

IRQ7

(Note 2)

Note 1

The interrupt assigned to this address can be changed to IRQ7 by

setting Bit 3 of the power and test register

Note 2

The parallel port address is selected according to bits 0 and 1 of

FAR or bit 6 of PNP0

Bits 2–5

These bits determine which ISA IO address

range is associated with each UART (see Tables

2-6 2-7 and 2-9)

TABLE 2-6 COM Port Selection for UART1

FAR

UART1

Bit 3

Bit 2

COM

1 (3F8-F)

2 (2F8-F)

3 (Table 2-8)

4 (Table 2-8)

Note

COM3 and COM4 addresses are determined by Bits 6 and 7

TABLE 2-7 COM Port Selection for UART2

FAR

UART2

Bit 5

Bit 4

COM

1 (3F8-F)

2 (2F8-F)

3 (Table 2-8)

4 (Table 2-8)

Note

COM3 and COM4 addresses are determined by Bits 6 and 7

Bits 6 7

These bits select the addresses that are used for

COM3 and COM4 (see Table 2-8)

TABLE 2-8 Address Selection for COM3 and COM4

Bit 7

Bit 6

COM3 IRQ4

COM4 IRQ3

3E8–Fh

2E8–Fh

338–Fh

238–Fh

2E8–Fh

2E0–7h

220–7h

228–Fh

TABLE 2-9 TRI-STATE Conditions of IRQ5 and IRQ7

Bit 4 of PNP0 e 0

Bit 4 of PNP0 e 1

IRQ5

((FARbit1 e 0) and (FARbit0 e 1)) or

(PNP0bit5 e 1) or

((FARbit1 e 0) and (FARbit0 e 0)) and

(FERbit0 e 0) or

(PTRbit3 e 1)) or

(CTRbit4 e 0 and PCRbit2 e 0)

IRQ7

((FARbit1 e 0) and (FARbit0 e 0)) and

(PNP0bit5 e 0) or

(PTRbit3 e 0)) or

(FERbit0 e 0) or

((FARbit1 e 1) and (FARbit0 e 0)) or

(CTRbit4 e 0 and PCRbit2 e 0)

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