TMS320C6457 DSP Host Port Interface HPI
Users Guide
Copyright 2009-2010, Texas Instruments Incorporated
SPRUGK7A -March 2009 -Revised July
Introduction to the HPI
List of Figures
List of Figures
List of Tables
Notational Conventions
Read This First
Preface
About This Manual
Figure 1. HPI Position in the Host-DSP System
Host Port Interface HPI
Users Guide
1 Introduction to the HPI
Introduction to the HPI
1.1 Summary of the HPI Registers
Table 1. Summary of HPI Registers
1.2 Summary of the HPI Signals
Table 2. HPI Signals
Host Port Interface HPI
Table 2. HPI Signals
continued
Introduction to the HPI
2.2 Dual-HPIA Mode
2 Using the Address Registers
2.1 Single-HPIA Mode
3 HPI Operation
3.1 Host-HPI Signal Connections
in the 32-Bit Multiplexed Mode
in the 16-Bit Multiplexed Mode
in the 32-Bit Multiplexed Mode
Multiplexed Mode
3.2 HPI Configuration and Data Flow
Figure 6. HPI Strobe and Select Logic
Table 3. Options for Connecting Host and HPI Data Strobe Pins
3.3 HDS2, HDS1, and HCS Data Strobing and Chip Selection
3.4 HCNTL10 and HR/W Indicating the Cycle Type
Table 4. Access Types Selectable by the HCNTL Signals
Table 5. Cycle Types Selectable With the HCNTL and HR/W Signals
3.6 HAS Forcing the HPI to Latch Control Information Early
Host Port Interface HPI
Figure 7. 16-Bit Multiplexed Mode Host Read Cycle Using HAS
HPI Operation
Host Port Interface HPI
Figure 8. 16-Bit Multiplexed Mode Host Write Cycle Using HAS
HPI Operation
Figure 9. 16-Bit Multiplexed Mode Host Read Cycle With HAS Tied High
3.7 Performing a Multiplexed Access Without HAS
Host Port Interface HPI
HPI Operation
3.9 Hardware Handshaking Using the HPI-Ready HRDY Signal
3.8 Single-Halfword HPIC Cycle in the 16-Bit Multiplexed Mode
Case 2 HPIA Write Cycle Followed by Autoincrement HPID Read Cycles
3.9.1 HRDY Behavior During 16-Bit Multiplexed Read Operations
Case 1 HPIA Write Cycle Followed by Nonautoincrement HPID Read Cycle
Case 2 Autoincrementing Selected, FIFO Empty Before Write
3.9.2 HRDY Behavior During 16-Bit Multiplexed Write Operations
Case 1 No Autoincrementing
3.9.3 HRDY Behavior During 32-Bit Multiplexed Read Operations
Case 3 Autoincrementing Selected, FIFO Not Empty Before Write
3.9.4 HRDY Behavior During 32-Bit Multiplexed Write Operations
Figure 21 shows an HPIA HCNTL10 = 10b write access followed by several autoincrement HPID HCNTL10 = 01b read accesses. Note that HRDY is active for the HPIA access. HRDY is also active for the first HPID read access, but not for subsequent read accesses
Case 1 HPIA Write Cycle Followed by Nonautoincrement HPID Read Cycle
Case 2 HPIA Write Cycle Followed by Autoincrement HPID Read Cycles
Case 1 No Autoincrementing
Figure 23 shows an HPIA HCNTL10 = 10b write access followed by an HPID HCNTL10 = 11b write access for 32-bit multiplexed HPI operation
Case 3 Autoincrementing Selected, FIFO Not Empty Before Write
Figure 25 shows an HPIA HCNTL10 = 10b write access when the write FIFO is not empty, followed by several autoincrementing HPID HCNTL10 = 01b write accesses. Note that HRDY is active twice for the HPIA access. This occurs because the FIFO is not empty and the data in the FIFO must first be written to memory. This results in an HRDY assertion immediately after the falling edge of the datastrobe HSTRB. When a write request to memory has been made that will empty the internal FIFO, the HPIA write operation can complete with the rising edge of HSTRB. The second HRDY assertion is for the write to the HPIA register. HRDY is not active for the HPID accesses
Case 2 Autoincrementing Selected, FIFO Empty Before Write
4.1 Polling the HRDY Bit
4 Software Handshaking Using the HPI Ready HRDY Bit
5.2 HINT Bit CPU-to-Host Interrupts
Figure 26. Host-to-CPU Interrupt State Diagram
5 Interrupts Between the Host and the CPU
5.1 DSPINT Bit Host-to-CPU Interrupts
CPU writes 0 to HINT bit
Figure 27. CPU-to-Host Interrupt State Diagram
No interrupt interrupt cleared HINT bit=0 HINT signal is high
Interrupt active HINT bit=1 HINT signal is low
Figure 28. FIFOs in the HPI
6 FIFOs and Bursting
6.1 Read Bursting
6.2 Write Bursting
6.3 FIFO Flush Conditions
6.4 FIFO Behavior When a Hardware Reset or Software Reset Occurs
7.1 Emulation Modes
7 Emulation and Reset Considerations
7.2 Software Reset Considerations
7.3 Hardware Reset Considerations
HPI Registers
8 HPI Registers
8.1 Introduction
Table 6. Host Port Interface HPI Registers
Host Port Interface HPI
8.2 Power and Emulation Management Register PWREMUMGMT
Figure 29. Power and Emulation Management Register PWREMUMGMT
HPI Registers
Table 8. Host Port Interface Control Register HPIC Field Descriptions
Figure 30. Host Access Permissions
Figure 31. CPU Access Permissions
8.3 Host Port Interface Control Register HPIC
For host write cycle
Field
Value
Description
31-0 ADDRESS R/W-0
LEGEND R = Read only W = Write -n = value after reset
31-0 ADDRESS R-0 LEGEND R = Read only -n = value after reset
8.4 Host Port Interface Address Registers HPIAW and HPIAR
Table 10. Data Register HPID Field Descriptions
8.5 Data Register HPID
Revision History
Appendix A Revision History
Table 11. TMS320C6457 HPI Revision History
Modified table
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power.ti.com
IMPORTANT NOTICE
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00 or 10 
00 or 10 
1st halfword 
2nd halfword
10 
10 
11 
11
10 
10 
01 
01 
01