EB632 datasheet(32/112 Pages) FREESCALE

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

Freescale Semiconductor

HDI16

9.2.2 2K87M Mask Set ISR Definitions

ISR is a status register by which the host processor interrogates the status and flags of the HDI16. The host

processor can write to this address without affecting the internal state of the HDI16. The SC140 core cannot access

ISR.

RXDF

Receive Data Full

Indicates whether the Receive Word Registers (RX[0

–3])

contain data from the SC140 core and can be read by the

host processor. RXDF is set when the HOTX is transferred

to the RX[0

–3] registers. RXDF is cleared when the host

processor reads the receive data registers (RX) at the last

address and the HOTX FIFO is empty. The host processor

can clear RXDF using the initialize function. RXDF can be

used to assert the external HREQ/HRRQ signal if RREQ is

set.

Regardless of whether the RXDF interrupt is enabled, RXDF

indicates whether the RX registers are full and data can be

latched out, so that the host processor can use polling

techniques.

The RX registers are not full.

The RX registers are full and can be read by the host

processor.

ISR

2K87M Mask Set Interface Status Register

0x2

Bit

—

TXDE3

TXDE1

RXDF3

RXDF1

HREQ

HF4

HF5

HF6

HF7

TRDY

TXDE

RXDF

Type

Reset

See Table 30

Table 30. 2K87M Mask Set ISR Bit Descriptions

Name

Description

Settings

—

0–3

Reserved. Write to zero for future compatibility.

TXDE32

Transmit Queue 32 Bytes Empty

< 32 bytes are empty

32 bytes are empty (24 bytes in HORX and 8 bytes in

TX)

TXDE16

Transmit Queue 16 Bytes Empty

< 16 bytes are empty

16 bytes are empty (8 bytes in HORX and 8 bytes in

TX)

RXDF32

Receive Queue 32 Bytes Full

< 32 bytes are full

32 bytes are full (24 bytes in HOTX and 8 bytes in

RX)

RXDF16

Receive Queue 16 Bytes Full

< 16 bytes are full

16 bytes are full (8 bytes in HOTX and 8 bytes in RX)

Table 29. 2K42A Mask Set ISR Bit Descriptions (Continued)

Name

Description

Settings

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