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參數(shù)資料
| 型號： | TMX320VC5421 |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | DIGITAL SIGNAL PROCESSOR |
| 中文描述： | 數(shù)字信號處理器 |
| 文件頁數(shù)： | 25/88頁 |
| 文件大?。?/td> | 1156K |
| 代理商： | TMX320VC5421 |
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TMS320VC5421
DIGITAL SIGNAL PROCESSOR
SPRS098 – DECEMBER 1999
25
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
HPI16 memory map (continued)
Some of the features of the HPI16 include:
16-bit bidirectional data bus
Multiple data strobes and control signals to allow glueless interfacing to a variety of hosts
Multiplexed and nonmultiplexed address/data modes
18-bit address bus used in nonmultiplexed mode to allow access to all internal memory (including internal
extended address pages)
18-bit address register used in multiplexed mode. Includes address autoincrement feature for faster
accesses to sequential addresses
Interface to on-chip DMA module to allow access to entire internal memory space
HRDY signal to hold off host accesses due to DMA latency
Control register available in multiplexed mode only. Accessible by either host or DSP to provide host/DSP
interrupts, extended addressing, and data prefetch capability
Maximum data rate of 33 megabytes per second (MBps) at 100-MHz DSP clock rate (no other DMA
channels active)
The HPI16 acts as a slave to a 16-bit host processor and allows access to the on-chip memory of the DSP. There
are two modes of operation as determined by the HMODE signal: multiplexed mode and nonmultiplexed mode.
HPI multiplexed mode
In multiplexedmode, HPI16 operation is very similar to that of the standard 8-bit HPI, which is available with
other ’C54x products. A host with a multiplexed address/data bus can access the HPI16 data register (HPID),
address register (HPIA), or control register (HPIC) via the HD bidirectional data bus. The host initiates the
access with the strobe signals (HDS1, HDS2, HCS) and controls the type of access with the HCNTL, HR/W,
and HAS signals. The DSP can interrupt the host via the HINT signal, and can stall host accesses via the HRDY
signal.
host/DSP interrupts
In multiplexedmode, the HPI16 offers the capability for the host and DSP to interrupt each other through the
HPIC register.
For host-to-DSP interrupts, the host must write a “1” to the DSPINT bit of the HPIC register. This generates an
interrupt to the DSP. This interrupt can also be used to wake the DSP from any of the IDLE 1,2, or 3 states. Note
that the DSPINT bit is always read as “0” by both the host and DSP. The DSP cannot write to this bit (see
Figure 7).
For DSP-to-host interrupts, the DSP must write a “1” to the HINT bit of the HPIC register to interrupt the host
via the HINT pin. The host acknowledges and clears this interrupt by also writing a “1” to the HINT bit of the HPIC
register. Note that writing a “0” to the HINT bit by either host or DSP has no effect.
A
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