TI380C27 Datasheet, PDF (22/77 Pages) Texas Instruments – DUAL-PROTOCOL COMMPROCESSOR

TI380C27
DUAL-PROTOCOL COMMPROCESSOR
SPWS014A – APRIL 1994 – REVISED MARCH 1995
User-Access Hardware Registers
80x8x 16-BIT MODE: (SI/M = 1, S8/SHALT = 0)†
WORD TRANSFERS
NORMAL MODE
SBHE = 0
SRS2 = 0
PSEUDO-DMA MODE ACTIVE
SBHE = 0
SRS2 = 0
BYTE TRANSFERS
SBHE = 0
SRS2 = 1
SRSX
SRS0
SRS1
0
0
0
SIFDAT MSB
0
0
1
SIFDAT/INC MSB
0
1
0
SIFADR MSB
0
1
1
SIFCMD
1
0
0
SIFACL MSB
1
0
1
SIFADR MSB
1
1
0
SIFADX MSB
1
1
1
DMALEN MSB
† _{SBHE = 1 and SRS2 = 1 are not defined.}
SBHE = 1
SRS2 = 0
SIFDAT LSB
SIFDAT/INC LSB
SIFADR LSB
SIFSTS
SIFACL LSB
SIFADR LSB
SIFADX LSB
DMALEN LSB
SBHE = 0
SRS2 = 1
SDMADAT MSB
DMALEN MSB
SDMAADR MSB
SDMAADX MSB
SIFACL MSB
SIFADR MSB
SIFADX MSB
DMALEN MSB
SBHE = 1
SRS2 = 0
SDMADAT LSB
DMALEN LSB
SDMAADR LSB
SDMAADX LSB
SIFACL LSB
SIFADR LSB
SIFADX LSB
DMALEN LSB
80x8x 8-BIT MODE: (SI/M = 1, S8/SHALT = 1)
SRSX
SRS0
SRS1
SRS2
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
NORMAL MODE
SBHE = X
SIFDAT LSB
SIFDAT MSB
SIFDAT/INC LSB
SIFDAT/INC MSB
SIFADR LSB
SIFADR MSB
SIFSTS
SIFCMD
SIFACL LSB
SIFACL MSB
SIFADR LSB
SIFADR MSB
SIFADX LSB
SIFADX MSB
DMALEN LSB
DMALEN MSB
PSEUDO-DMA MODE ACTIVE
SBHE = X
SDMADAT LSB
SDMADAT MSB
DMALEN LSB
DMALEN MSB
SDMAADR LSB
SDMAADR MSB
SDMAADX LSB
SDMAADX MSB
SIFACL LSB
SIFACL MSB
SIFADR LSB
SIFADR MSB
SIFADX LSB
SIFADX MSB
DMALEN LSB
DMALEN MSB
68xxx MODE: (SI/M = 0)‡
WORD TRANSFERS
BYTE TRANSFERS
SRSX
SRS0
SRS1
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
‡ _{68xxx mode is always 16 bit.}
SUDS = 0
SLDS = 1
NORMAL MODE
SUDS = 0
SLDS = 0
SUDS = 1
SLDS = 0
SIFDAT MSB
SIFDAT/INC MSB
SIFADR MSB
SIFCMD
SIFACL MSB
SIFADR MSB
SIFADX MSB
DMALEN MSB
SIFDAT LSB
SIFDAT/INC LSB
SIFADR LSB
SIFSTS
SIFACL LSB
SIFADR LSB
SIFADX LSB
DMALEN LSB
PSEUDO-DMA MODE ACTIVE
SUDS = 0
SLDS = 0
SUDS = 0
SLDS = 1
SUDS = 1
SLDS = 0
SDMADAT MSB
DMALEN MSB
SDMAADR MSB
SDMAADX MSB
SIFACL MSB
SIFADR MSB
SIFADX MSB
DMALEN MSB
SDMADAT LSB
DMALEN LSB
SDMAADR LSB
SDMAADX LSB
SIFACL LSB
SIFADR LSB
SIFADX LSB
DMALEN LSB
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