Samsung YP-P10 User Manual download pdf (Page 475)

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101

MMC/SD/SDIO CONTROLLER S3C2440A RISC MICROPROCESSOR

19-12

SDI Fifo Status Register (SDIFSTA)

SDIFSTA 0x5A000038 R/(C) SDI FIFO status register 0x0

SDIFSTA Bit Description Initial State

Reserved [31:16] – –

FIFO reset(FRST) [16]

Reset FIFO value. This bit is automatically cleared.

0 = Normal mode, 1 = FIFO reset

FIFO fail error (FFfail) [15:14]

R/C

FIFO fail error when FIFO occurs overrun / underrun data

saving. This flag is cleared by setting to one these bits.

00 = Not detect, 01 = FIFO fail

10 = FIFO fail in the last transfer (only FIFO reset need)

11 = Reserved

FIFO available detect

for Tx (TFDET)

[13] This bit indicates that FIFO data is available for transmit when

DatMode is data transmit mode. If DMA mode is enable, sd

host requests DMA operation.

0 = Not detect(FIFO full), 1 = Detect (0 ≤ FIFO ≤ 63)

FIFO available detect

for Rx (RFDET)

[12] This bit indicates that FIFO data is available for receive when

DatMode is data receive mode. If DMA mode is enable, sd

host requests DMA operation.

0 = Not detect(FIFO empty), 1 = Detect (1 ≤ FIFO ≤ 64)

Tx FIFO half full

(TFHalf)

[11] This bit sets to 1 whenever Tx FIFO is less than 33byte.

0 = 33 ≤ Tx FIFO ≤ 64, 1 = 0 ≤ Tx FIFO ≤ 32

Tx FIFO empty

(TFEmpty)

[10] This bit sets to 1 whenever Tx FIFO is empty.

0 = 1 ≤ Tx FIFO ≤ 64, 1 = Empty (0byte)

Rx FIFO last data

ready (RFLast)

[9]

R/C

This bit sets to 1 when Rx FIFO occurs to behave last data of

all block. This flag is cleared by setting to one this bit.

0 = Not received yet, 1 = Rx FIFO gets Last data

Rx FIFO full (RFFull) [8] This bit sets to 1 whenever Rx FIFO is full.

0 = 0 ≤ Rx FIFO ≤ 63, 1 = Full (64byte)

Rx FIFO half full

(RFHalf)

[7] This bit sets to 1 whenever Rx FIFO is more than 31byte.

0 = 0 ≤ Rx FIFO ≤ 31, 1 = 32 ≤ Rx FIFO ≤ 64

FIFO count (FFCNT) [6:0] Number of data(byte) in FIFO 0000000

NOTE: Although the last Rx data size is lager than remained count of FIFO data, you could read this data. If this event

happens, you should clear FFfail field, and FIFO reset field

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Samsung YP-P10 User Manual Page 475

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