PC87413 datasheet(86/257 Pages) NSC

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3.0 Device Architecture and Configuration (Continued)

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3.15.15 X-Bus Memory Size Configuration Register (XMEMSIZE)

This register defines the size of each user-defined memory zone mapped to the X-Bus. This register is reset by hardware

to 00h.

Power Well:VSB

Location:Index FBh

Type:

R/W or RO

3.15.16 X-Bus IRQ Mapping Register (XIRQMAP)

This register defines the mapping of the XIRQ signal.

Power Well:VSB

Location:Index FCh

Type:

R/W

Bit

76543210

Name

Reserved

MEMSIZE

Reset

00000000

Bit

Description

7-4

Reserved.

3-0

MEMSIZE (User-Defined Memory Zone Size). Deﬁnes the size of one zone window (in bytes). The size is

deﬁned as a power of two using the equation: NumOfBytes = 2n (where n = the value of the MEMSIZE ﬁeld

+16). The zone must always be aligned to the window size (i.e., for a 128 Kbyte window, the 17 LSBs of the

address must be zero).

Bits

3 2 1 0

Size (Bytes)

0 0 0 0:

64K (216 - default)

...

1 0 0 0:

16M (224)

Other:

Reserved

Bit

76543210

Name

Reserved

IRQMAP

Reset

00000000

Bit

Description

7-4

Reserved.

3-0

IRQMAP (XIRQ Mapping). Deﬁnes to which host IRQ the XIRQ input is routed.

Bits

3 2 1 0

Function

0 0 0 0:

IRQ Disabled (default)

0 0 0 1:

IRQ1

. . .

1 1 1 1:

IRQ 15

PC87413 数据表(PDF) 86 Page - National Semiconductor (TI)

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PC87413 数据表(PDF) 86 Page - National Semiconductor (TI)

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