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參數(shù)資料
| 型號(hào)： | TMS320F243PGEQ |
| 元件分類(lèi)： | 數(shù)字信號(hào)處理 |
| 英文描述： | 16-Bit Digital Signal Processor |
| 中文描述： | 16位數(shù)字信號(hào)處理器 |
| 文件頁(yè)數(shù)： | 45/116頁(yè) |
| 文件大小： | 1485K |
| 代理商： | TMS320F243PGEQ |
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TMS320F243, TMS320F241
DSP CONTROLLERS
SPRS064B – DECEMBER 1997 – REVISED FEBRUARY 1999
45
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
peripherals
The integrated peripherals of the TMS320x24x are described in the following subsections:
External memory interface (’F243 only)
Event-manager (EV2) module
Analog-to-digital converter (ADC) module
Serial peripheral interface (SPI) module
Serial communications interface (SCI) module
Controller area network (CAN) module
Watchdog (WD) timer module
external memory interface (’F243 only)
The TMS320F243 can address up to 64K
×
16 words of memory (or registers) in each of the program, data,
and I/O spaces. On-chip memory, when enabled, occupies some of this off-chip range. In data space, the high
32K words can be mapped dynamically either locally or globally using the global memory allocation register
(GREG) as described in the TMS320C241/C242/C243 DSP Controllers CPU, System, Instruction Set, and
Peripherals Reference Guide(literature number SPRU276). Access to a data-memory location, that is mapped
as global, asserts the BR pin low.
The CPU of the TMS320F243 schedules a program fetch, data read, and data write on the same machine cycle.
This is because from on-chip memory, the CPU can execute all three of these operations in the same cycle.
However, the external interface multiplexes the internal buses to one address and one data bus. The external
interface sequences these operations to complete first the data write, then the data read, and finally the program
read.
The ’F243 supports a wide range of system interfacing requirements. Program, data, and I/O address spaces
provide interface to memory and I/O, thereby maximizing system throughput. The full 16-bit address and data
bus, along with the PS, DS, and IS space-select signals, allow addressing of 64K 16-bit words in program, data,
and I/O space. Since on-chip peripheral registers occupy positions of data-memory space, the externally
addressable data-memory space is 32K 16-bit words.
I/O design is simplified by having I/O treated the same way as memory. I/O devices are accessed in the I/O
address space using the processor’s external address and data buses in the same manner as memory-mapped
devices.
The ’F243 external parallel interface provides various control signals to facilitate interfacing to the device. The
R/W output signal is provided to indicate whether the current cycle is a read or a write. The STRB output signal
provides a timing reference for all external cycles. For convenience, the device also provides the RD and the
WE output signals, which indicate a read and a write cycle, respectively, along with timing information for those
cycles. The availability of these signals minimizes external gating necessary for interfacing external devices to
the ’F243.
The bus request (BR) signal is used in conjunction with other ’F243 interface signals to arbitrate external global
memory accesses. Global memory is external data memory space in which the BR signal is asserted at the
beginning of the access. When an external global memory device receives the bus request, it responds by
asserting the READY signal after the global memory access is arbitrated and the global access is completed.
The TMS320F243 supports zero-wait-state reads on the external interface. However, to avoid bus conflicts,
writes take two cycles. This allows the TMS320F243 to buffer the transition of the data bus from input to output
(or output to input) by a half cycle. In most systems, TMS320F243 ratio of reads to writes is significantly large
to minimize the overhead of the extra cycle on writes.
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