參數(shù)資料
型號(hào)： DSPB56364AF100
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 138/148頁(yè)
文件大?。?/td> 0K
描述： IC DSP 24BIT AUD 100MHZ 100-LQFP
標(biāo)準(zhǔn)包裝： 90
系列： DSP56K/Symphony
類(lèi)型： 音頻處理器
接口： 主機(jī)接口，I²C，SAI，SPI
時(shí)鐘速率： 100MHz
非易失內(nèi)存： ROM（24 kB）
芯片上RAM： 11.25kB
電壓 - 輸入/輸出： 3.30V
電壓 - 核心： 3.30V
工作溫度： -40°C ~ 105°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 100-LQFP
供應(yīng)商設(shè)備封裝： 100-LQFP（14x14）
包裝： 托盤(pán)
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External Memory Expansion Port (Port A)
DSP56364 Technical Data, Rev. 4.1
Freescale Semiconductor
2-5
2.5.2
External Data Bus
2.5.3
External Bus Control
Table 2-6 External Data Bus Signals
Signal
Name
Type
State During
Reset
Signal Description
D0–D7
Input/
Output
Tri-stated
Data Bus—D0–D7 are active-high, bidirectional input/outputs that provide the
bidirectional data bus for external program and data memory accesses. D0–D7 are
tri-stated during hardware reset and when the DSP is in the stop or wait low-power
standby mode.
Table 2-7 External Bus Control Signals
Signal Name
Type
State During
Reset
Signal Description
AA0–AA1/
RAS0–RAS1
Output
Tri-stated
Address Attribute or Row Address Strobe—When defined as AA, these signals
can be used as chip selects or additional address lines. When defined as
RAS,
these signals can be used as
RAS for DRAM interface. These signals are
tri-stateable outputs with programmable polarity. These signals are tri-stated during
hardware reset and when the DSP is in the stop or wait low-power standby mode.
CAS
Output
Tri-stated
Column Address Strobe—
CAS is an active-low output used by DRAM to strobe
the column address. This signal is tri-stated during hardware reset and when the
DSP is in the stop or wait low-power standby mode.
RD
Output
Tri-stated
Read Enable—
RD is an active-low output that is asserted to read external memory
on the data bus. This signal is tri-stated during hardware reset and when the DSP
is in the stop or wait low-power standby mode.
WR
Output
Tri-stated
Write Enable—
WR is an active-low output that is asserted to write external
memory on the data bus. This signal is tri-stated during hardware reset and when
the DSP is in the stop or wait low-power standby mode.
TA
Input
Ignored Input
Transfer Acknowledge—If there is no external bus activity, 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) may be
added to the wait states inserted by the 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
the internal system clock. The number of wait states is determined by the
TA input
or by the bus control register (BCR), whichever is longer. The BCR can be used to
set the minimum number of wait states in external bus cycles.
In order 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 (OMR).
TA functionality may not be used while performing DRAM type accesses, otherwise
improper operation may result.
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