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| 型号： | DSP56303AG100 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 98/108页 |
| 文件大小： | 0K |
| 描述： | IC DSP 24BIT 100MHZ 144-LQFP |
| 特色产品： | DSP56303 24-bit Digital Signal Processor |
| 标准包装： | 60 |
| 系列： | DSP563xx |
| 类型： | 定点 |
| 接口： | 主机接口，SSI，SCI |
| 时钟速率： | 100MHz |
| 非易失内存： | ROM（576 B） |
| 芯片上RAM： | 24kB |
| 电压 - 输入/输出： | 3.30V |
| 电压 - 核心： | 3.30V |
| 工作温度： | -40°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 144-LQFP |
| 供应商设备封装： | 144-LQFP（20x20） |
| 包装： | 托盘 |
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External Memory Expansion Port (Port A)
DSP56303 Technical Data, Rev. 11
Freescale Semiconductor
1-5
1.5.2
External Data Bus
1.5.3
External Bus Control
Table 1-7.
External Data Bus Signals
Signal
Name
Type
State
During
Reset
State
During Stop
or Wait
Signal Description
D[0–23]
Input/ Output
Ignored Input
Last state:
Input: Ignored
Output:
Tri-stated
Data Bus—When the DSP is the bus master, D[0–23] are active-high,
bidirectional input/outputs that provide the bidirectional data bus for external
program and data memory accesses. Otherwise, D[0–23] are tri-stated.
Table 1-8.
External Bus Control Signals
Signal
Name
Type
State During Reset,
Stop, or Wait
Signal Description
AA[0–3]
RAS[0–3]
Output
Tri-stated
Address Attribute—When defined as AA, these signals can be used as chip selects or
additional address lines. The default use defines a priority scheme under which only
one AA signal can be asserted at a time. Setting the AA priority disable (APD) bit (Bit
14) of the Operating Mode Register, the priority mechanism is disabled and the lines
can be used together as four external lines that can be decoded externally into 16 chip
select signals.
Row Address Strobe—When defined as RAS, these signals can be used as RAS for
DRAM interface. These signals are tri-statable outputs with programmable polarity.
RD
Output
Tri-stated
Read Enable—When the DSP is the bus master, RD is an active-low output that is
asserted to read external memory on the data bus (D[0–23]). Otherwise, RD is tri-
stated.
WR
Output
Tri-stated
Write Enable—When the DSP is the bus master, WR is an active-low output that is
asserted to write external memory on the data bus (D[0–23]). Otherwise, the signals
are tri-stated.
TA
Input
Ignored Input
Transfer Acknowledge—If the DSP56303 is the bus master and there is no external
bus activity, or the DSP56303 is not the bus master, the TA input is ignored. The TA
input is a data transfer acknowledge (DTACK) function that can extend an external bus
cycle indefinitely. Any number of wait states (1, 2. . .infinity) can be added to the wait
states inserted by the bus control register (BCR) by keeping TA deasserted. In typical
operation, TA is deasserted at the start of a bus cycle, is asserted to enable completion
of the bus cycle, and is deasserted before the next bus cycle. The current bus cycle
completes one clock period after TA is asserted synchronous to CLKOUT. The number
of wait states is determined by the TA input or by the BCR, whichever is longer. The
BCR can be used to set the minimum number of wait states in external bus cycles.
To use the TA functionality, the BCR must be programmed to at least one wait state. A
zero wait state access cannot be extended by TA deassertion; otherwise, improper
operation may result. TA can operate synchronously or asynchronously depending on
the setting of the TAS bit in the Operating Mode Register. TA functionality cannot be
used during DRAM type accesses; otherwise improper operation may result.
BR
Output
Reset: Output
(deasserted)
State during Stop/Wait
depends on BRH bit
setting:
BRH = 0: Output,
deasserted
BRH = 1: Maintains last
state (that is, if asserted,
remains asserted)
Bus Request—Asserted when the DSP requests bus mastership. BR is deasserted
when the DSP no longer needs the bus. BR may be asserted or deasserted
independently of whether the DSP56303 is a bus master or a bus slave. Bus “parking”
allows BR to be deasserted even though the DSP56303 is the bus master. (See the
description of bus “parking” in the BB signal description.) The bus request hold (BRH)
bit in the BCR allows BR to be asserted under software control even though the DSP
does not need the bus. BR is typically sent to an external bus arbitrator that controls the
priority, parking, and tenure of each master on the same external bus. BR is affected
only by DSP requests for the external bus, never for the internal bus. During hardware
reset, BR is deasserted and the arbitration is reset to the bus slave state.
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