AT83SND1CXXX-ROTIL datasheet(117/212 Pages) ATMEL

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117

4109J–8051–10/06

AT8xC51SND1C

Figure 15-14. Data Line Controller Block Diagram

15.6.1

FIFO Implementation

The 16-Byte FIFO is based on a dual 8-Byte FIFOs managed using 2 pointers and four flags

indicating the status full and empty of each FIFO.

Pointers are not accessible to user but can be reset at any time by setting and clearing DRPTR

and DTPTR bits in MMCON0 register. Resetting the pointers is equivalent to abort the writing or

reading of data.

F1EI and F2EI flags in MMINT register signal when set that respectively FIFO1 and FIFO2 are

empty. F1FI and F2FI flags in MMINT register signal when set that respectively FIFO1 and

FIFO2 are full. These flags may generate an MMC interrupt request as detailed in

Section “Interrupt”.

15.6.2

Data Configuration

Before sending or receiving any data, the data line controller must be configured according to

the type of the data transfer considered. This is achieved using the Data Format bit: DFMT in

MMCON0 register. Clearing DFMT bit enables the data stream format while setting DFMT bit

enables the data block format. In data block format, user must also configure the single or multi-

block mode by clearing or setting the MBLOCK bit in MMCON0 register and the block length

using BLEN3:0 bits in MMCON1 according to Table 101. Figure 15-15 summarizes the data

modes configuration flows.

Table 101. Block Length Programming

MCBI

MMINT.1

DATFS

MMSTA.3

CRC16S

MMSTA.4

F2FI

MMINT.3

F2EI

MMINT.1

DFMT

MMCON0.2

MBLOCK

MMCON0.3

DATDIR

MMCON1.3

Data Converter

// -> Serial

BLEN3:0

MMCON1.7:4

DATEN

MMCON1.2

DATA Line

Finished State Machine

Data Converter

Serial -> //

DTPTR

MMCON0.6

DRPTR

MMCON0.7

TX Pointer

RX Pointer

8-Byte

FIFO 1

8-Byte

FIFO 2

16-Byte FIFO

MMDAT

F1EI

MMINT.0

CRC16 and Format

Checker

F1FI

MMINT.2

EOFI

MMINT.4

CBUSY

MMSTA.5

CRC16

Generator

MDAT

BLEN3:0

Block Length (Byte)

BLEN = 0000 to 1011

Length = 2

BLEN: 1 to 2048

> 1011

Reserved: do not program BLEN3:0 > 1011

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