SIO1007 datasheet(71/108 Pages) MICROCHIP

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DS00002020A-page 71

SIO1007

18.4.29

CR1E

CR1E can only be accessed in the configuration state and after the CSR has been initialized to 1EH. CR1E is used to

set the SCE (FIR) base address - High Byte ADR[15:11].

The SCE (FIR) logical device base address is initialized using the base address bits located in two configuration regis-

ters: CR2B-low byte and CR1E-high byte. The SCE base address can be set to 8160 locations on 8-byte boundaries

from 0000H - FFF8H.

The SCE (FIR) base address bits A[2:0] are decoded as 000b. The SCE (FIR) block uses full 16-bit addressing decod-

ing. An address matching the SCE (FIR) base address bits A[15:3] is decoded using the specific address bits A[2:0] to

target registers in SCE (FIR).

When the SCE (FIR) logical device activate bit in CR3A-bit0 is cleared to 0, no address decoding takes place for the

SCE (FIR) logical device.

18.4.30

CR1F

CR1F can only be accessed in the configuration state and after the CSR has been initialized to 1Fh. CR1F is used to

select the low byte of the base address (ADR[9:3] bits of CIrCC2 Logical Device.

The CIRCC2 logical device base address is initialized using the base address bits located in two configuration registers:

CR1F-low byte and CR20-high byte. The CIRCC2 base address can be set to 8,192 locations on 8-byte boundaries

from 0000H - FFF8H.

The CIRCC2 base address bits A[2:0] are decoded as 000b. The CIRCC2 block uses full 16-bit addressing decoding.

An address matching the CIRCC2 base address bits A[15:3] is decoded using the specific address bits A[2:0] to target

registers in CIRCC2.

TABLE 18-24: CR1D

Test 5

Type: R/W

Default: 0x00 on VCC POR

BIT NO.

BIT NAME

DESCRIPTION

Test 32

RESERVED FOR MICROCHIP USE

Test 33

Test 34

Test 35

Test 36

Test 37

Test 38

Test 39

TABLE 18-25: CR1E

SCE (FIR) Base Address Register - High Byte

Type: R/W

Default: 0x00 on VCC POR

BIT NO.

BIT NAME

DESCRIPTION

ADR11

FIR Base Address bits for decoder.

ADR12

ADR13

ADR14

ADR15

RESERVED

Reads return 0. Writes have no effect.

RESERVED

Reads return 0. Writes have no effect.

RESERVED

Reads return 0. Writes have no effect.

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