UT1553B/BCRTMP-WPA 查看數據表（PDF） - Aeroflex UTMC

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UT1553B/BCRTMP-WPA

Bus Controller Remote Terminal Multi-Protocol (BCRTMP)

Aeroflex UTMC 

DMA SIGNALS

NAME

DMAR

DMAG

DMAGO

DMACK

BURST

TSCTL

PIN NUMBER

F/P

PGA

72

F14

73

F13

78

E13

75

D15

77

D14

76

C15

TYPE ACTIVE

DESCRIPTION

TTO

ZL DMA Request. The BCRTMP issues this signal when access

to RAM is required. It goes inactive after receiving aDMAG

signal.

TI

AL DMA Grant. This input to the BCRTMP allows the

BCRMTP to access RAM. It is recognized 45ns before

the rising edge of MCLKD2.

TTO

AL DMA Grant Out. If DMAG is received but not needed, it

passes through to this output.

TO

ZL DMA Acknowledge. The BCRTMP asserts this signal to

confirm receipt of DMAG, it stays low until memory access

is complete.

TO

AH Burst (DMA Cycle). This indicates that the current

DMA cycle transfers at least two words; worst-case is five

words plus a “dummy” word.

TO

AL

Three-State Control. This signal indicates when the

BCRTMP is actually accessing memory. The host

subsystem’s address and data lines must be in the high-

impedance state when the signalis active. This signal assists

in placing the external data and address buffers into the high-

impedance state.

BCRTMP-11

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