参数资料
型号: PSD835G2V-A-20J
厂商: 意法半导体
英文描述: Configurable Memory System on a Chip for 8-Bit Microcontrollers
中文描述: 在8片位微控制器可配置存储系统
文件页数: 42/110页
文件大小: 570K
代理商: PSD835G2V-A-20J
PSD835G2
PSD8XX Family
41
9.2.2.6 Input Micro
Cells (IMCs)
The CPLD has 24 IMCs, one for each pin on Ports A, B, and C. The architecture of the IMC
is shown in Figure 14. The IMCs are individually configurable, and can be used as a latch,
register, or to pass incoming Port signals prior to driving them onto the PLD input bus. The
outputs of the IMCs can be read by the microcontroller through the internal data bus.
The enable for the latch and clock for the register are driven by a multiplexer whose inputs
are a product term from the CPLD AND array or the MCU address strobe (ALE/AS). Each
product term output is used to latch or clock four IMCs. Port inputs 3-0 can be controlled by
one product term and 7-4 by another.
Configurations for the IMCs are specified by PSDsoft. Outputs of the IMCs can be read by
the MCU via the IMC buffer. See the I/O Port section on how to read the IMCs.
IMCs can use the address strobe to latch address bits higher than A15. Any latched
addresses are routed to the PLDs as inputs.
IMCs are particularly useful with handshaking communication applications where two
processors pass data back and forth through a common mailbox. Figure 15 shows a typical
configuration where the Master MCU writes to the Port A Data Out Register. This, in turn,
can be read by the Slave MCU via the activation of the
Slave-Read
output enable product
term. The Slave can also write to the Port A IMCs and the Master can then read the IMCs
directly. Note that the
Slave-Read
and
Slave-Wr
signals are product terms that are
derived from the Slave MCU inputs RD, WR, and Slave_CS.
The
PSD835G2
Functional
Blocks
(cont.)
OUTPUT
MICRO
CELLS A
AND
MICRO
CELL B
PT
PT
FEEDBACK
A
P
PORT
DRIVER
I/O PIN
INTERNAL DATA BUS
DIRECTION
REGISTER
MUX
MUX
ALE/AS
PT
Q
Q
D
D
G
LATCH
INPUT MICRO
CELL
ENABLE (.OE)
D FF
INPUT MICRO
CELL_ RD
Figure 14. Input Micro
Cell
相关PDF资料
PDF描述
PSD835G2V-A-20JI Configurable Memory System on a Chip for 8-Bit Microcontrollers
PSD835G2V-A-20M Configurable Memory System on a Chip for 8-Bit Microcontrollers
PSD835G2V-A-20MI Configurable Memory System on a Chip for 8-Bit Microcontrollers
PSD835G2V-A-20U Configurable Memory System on a Chip for 8-Bit Microcontrollers
PSD835G2V-A-20UI Configurable Memory System on a Chip for 8-Bit Microcontrollers
相关代理商/技术参数
参数描述
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