EB632 datasheet(23/112 Pages) FREESCALE

23 / 112 page

HDI16

Functional Differences Between MSC8101 (Mask 2K42A) and MSC8103 (Mask 2K87M), Rev. 2

Freescale Semiconductor

ICR is a read/write control register that allows the use of bit manipulation instructions on control

SC140 core cannot access the ICR. The HPCR[DMA] bit and the HCR[HICR] bit control the

function of the ICR bits.

ICR

Mask Set 2K42A Interface Control Register (DMA = 0, HICR = 0)

0x0

Bit

—

HF0

HF1

—

INIT

HDM

HF2

HF3 HDRQ TREQ RREQ

Type

R/W

Reset

See Table 18 on page 25

ICR

Mask Set 2K42A Interface Control Register (DMA = 1, HICR = 0)

0x0

Bit

—

HF0

HF1

—

INIT

HDM

HF2

HF3

—

Note 1 Note 2

Type

R/W

Reset

See Table 18 on page 25

Notes:

HDM0 when read, TREQ when written

HDM0 when read, RREQ when written

Table 17. Mask Set 2K42A ICR Bit Descriptions

Name

Description

—

0–4

Reserved. Write to zero for future compatibility.

HF0

Host Flag 0

A general-purpose flag for host-to-core communication. The host processor can set or clear HF0. HF0 is reflected in the HSR

on the core side of the HDI16.

HF1

Host Flag 1

A general-purpose flag for host-to-core communication. The host processor can set or clear HF1. HF1 is reflected in the HSR

on the core side of the HDI16.

—

Reserved. Write to zero for future compatibility.

INIT

Force Initialization

Used by the host processor to force initialization of the HDI16 hardware (which may or may not be necessary, depending on

the software design of the interface). During initialization, the HDI16 transmit and receive control bits are configured. The type

of initialization performed when the INIT bit is set depends on the state of TREQ and RREQ in the HDI16. The INIT command,

which is local to the HDI16, conveniently configures the HDI16 into the desired data transfer mode. The effect of the INIT

command is described in Table 19. When the host sets the INIT bit, the HDI16 hardware executes the INIT command. The

interface hardware clears the INIT bit after the command executes.

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