ML7396AB datasheet(30/140 Pages) LAPIS

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FEDL7396A/B/E-07

ML7396A/B/E

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RX FIFO usage notification function

This function is to notice un-read data in RX_FIFO (FIFO usage) to the MCU using SINTN (interrupt) pin (#10) and/or

DMON pin (#17). If un-read data in RX_FIFO (FIFO usage) exceeds the full level threshold set by [RX_ALARM_LH:B0

0x37] register, SINTN pin will become “L” (FIFO-Full interrupt) and/or DMON pin will become “H”. And if the RX_FIFO

usage is equal to or less than the empty threshold level set by [RX_ALARM_HL:B0 0x38] register, SINTN will becom “L”

(FIFO-Empty interrupt) and/or DMON pin will become “L”.

If re-generating the FIFO-Full interrupr (INT[05], group1), after clearing the interrupt, once the RX_FIFO usage should be

equal or less than the empty level. If re-generating the FIFO-Empty interrupt (INT[04], group1), after clearing the interrupt,

one the RX_FIFO usage excceds the full level threshold.

RX emptylevel

(address=0x0F)

RX full level

(address=0x3E)

0x00

0xFF

DMON pin will be

“H” when RX data

exceeds RX full

level.

DMON pin will be

“L” when un-read

data amount is

less than RX

empty level.

[RX FIFO usage]

Time

RX full level

RX empty level

DMON signal

RX data amount

RX_FIFO usage transition

SINTN signal

0x0F

0x3E

[Note]

At default setting, DMON pin is configured as CLKOUT output. If using DMON pin as this function, CLKOUT_EN

([CLK_SET:B0 0x02(4)]) =0b0 and FIFO_TRG_EN ([CRC_AREA/FIFO_TRG:B0 0x77(0)]) =0b1 are required.

Each threshold should set as [RX_ALARM_LH:B0 0x37] (full level) > [RX_ALARM_HL:B0 0x38] (empty level).

If reading a portion of RX data from a FIFO before receiving RX completion interrupt (INT[18]/INT[19] group3), please

keep the FIFO remaining size indicated by [RD_FIFO_LAST:B0 0x7C] should be more than 0x01.

This function is valid only when data receiving. After RX completion, FIFO-Empty interrupt (INT[04] group1) is not

generated.

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