Texas Instruments TMS380C26 User Manual
Page 25
TMS380C26
NETWORK COMMPROCESSOR
SPWS010A–APRIL 1992–REVISED MARCH 1993
POST OFFICE BOX 1443
•
HOUSTON, TEXAS
77251–1443
25
User-Access Hardware Registers
808x 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
SBHE = 1
SRS2 = 1
SRS2 = 0
SBHE = 0
SBHE = 1
SRS2 = 1
SRS2 = 0
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
SIFDAT MSB
SIFDAT LSB
SIFDAT/INC MSB
SIFDAT/INC LSB
SIFADR MSB
SIFADR LSB
SIFCMD
SIFSTS
SIFACL MSB
SIFACL LSB
SIFADR MSB
SIFADR LSB
SIFADX MSB
SIFADX LSB
DMALEN MSB
DMALEN LSB
—
SDMADAT
DMALEN MSB
DMALEN LSB
SDMAADR MSB
SDMAADR LSB
SDMAADX MSB
SDMAADX LSB
SIFACL MSB
SIFACL LSB
SIFADR MSB
SIFADR LSB
SIFADX MSB
SIFADX LSB
DMALEN MSB
DMALEN LSB
† (SBHE = 1 and SRS2 = 1 is not defined)
808x 8-Bit Mode: (SI/M = 1, S8/SHALT = 1)
SRSX
SRS0
SRS1
SRS2
Normal
SBHE = X
Pseudo-DMA
SBHE = X
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
1
0
0
0
1
0
0
1
1
0
1
0
1
0
1
1
1
1
0
0
1
1
0
1
1
1
1
0
1
1
1
1
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
SDMADAT
—
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
Normal Mode
SUDS = 0
SLDS = 0
Pseudo-DMA Mode Active
SUDS = 0
SLDS = 0
Byte Transfers
SUDS = 0
SUDS = 1
SLDS = 1
SLDS = 0
SUDS = 0
SUDS = 1
SLDS = 1
SLDS = 0
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
SIFDAT MSB
SIFDAT LSB
SIFDAT/INC MSB
SIFDAT/INC LSB
SIFADR MSB
SIFADR LSB
SIFCMD
SIFSTS
SIFACL MSB
SIFACL LSB
SIFADR MSB
SIFADR LSB
SIFADX MSB
SIFADX LSB
DMALEN MSB
DMALEN LSB
—
SDMADAT
DMALEN MSB
DMALEN LSB
SDMAADR MSB
SDMAADR LSB
SDMAADX MSB
SDMAADX LSB
SIFACL MSB
SIFACL LSB
SIFADR MSB
SIFADR LSB
SIFADX MSB
SIFADX LSB
DMALEN MSB
DMALEN LSB
‡ 68xxx Mode is always 16-bit.