Motorola MSC8101 ADS User's Guide Page 288

  • Download
  • Add to my manuals
  • Print
  • Page
    / 346
  • Table of contents
  • BOOKMARKS
  • Rated. / 5. Based on customer reviews
Page view 287
Programming Reference
A-34 MSC8101 User’s Guide
0123456789101112131415
HAP HRP
HPCR
Host Port Control Register
Address: 0x0020
Hardware Reset: 0,
Read/Write
HOST INTERFACE
H8BITHDSP DMA OAD
0 HREQ signal is an active low output
Single host request mode (HDRQ cleared in ICR)
HRP – Host Request Polarity, Bit 1
1 Host DMA mode is enabled
0 Host DMA mode is disabled
DMA – Host DMA Mode Enable, Bit 14
(HDI16)
HDDS
1 8-bit mode is enabled
0 16-bit mode is enabled (default)
H8BIT – H8-Bit Mode, Bit 9
1 HDI16 operates as the host interface
0 HDI16 host interface disabled
HEN – Host Enable, Bit 8
Individual Reset: All bit values are indeterminate after reset
0
*
1 HDI16 operates in dual-strobe bus mode
0 HDI16 operates in single-strobe bus mode
HDDS – Host Dual Data Strobe, Bit 3
*
= Reserved. Write to 0 for future compatibility
00
**
HEN
0000
****
1 HACK signal is configured as an active high input
0 HACK signal is configured as an active low input
HAP – Host Acknowledge Polarity, Bit 0
1 HREQ signal is an active high output
In double host request mode (HDRQ set in ICR)
0 HTRQ and HRRQ signals are active low outputs
1 HTRQ and HRRQ signals are active high outputs
0 HACK input pin is used as a DMA transfer acknowledge
OAD – One-Address Host DMA Mode Enable, Bit 15
input
1 Host address 0x4 is used as a host DMA transfer
acknowledge input
1 Data strobe signals are configured as active high inputs
0 Data strobe signals are configured as active low inputs
HDSP – Host Data Strobe Polarity, Bit 6
HPC1
Note 1:
Before setting this bit, ensure that BCR[ISPS] is set to 1
*
0
Page view 287
1 2 ... 283 284 285 286 287 288 289 290 291 292 293 ... 345 346

Comments to this Manuals

No comments