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| 型号： | PSD703S5 |
| 英文描述： | Field Programmable Microcontroller Peripherals with Supervisory Functions(可编程逻辑，4K位SRAM,27个可编程I/O,通用PLD有66个输入) |
| 中文描述： | 现场可编程微控制器外围设备具有监督职能（可编程逻辑，4K的位的SRAM，27余个可编程输入/输出，通用PLD的有66个输入） |
| 文件页数： | 18/104页 |
| 文件大小： | 515K |
| 代理商： | PSD703S5 |
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PSD7XX Family
13-18
ECSPLD Output
Port A, B, or D Assignments
ECS0
ECS1
ECS2
ECS3
ECS4
ECS5
ECS6
PA0, PB0
PA1, PB1
PA2, PB2
PA3, PB3
PD0*
PD1*
PD2*
Table 10. ECSPLD Output Port Assignments
The seven ECSPLD outputs may be driven off the device through Ports A, B, or D, as
shown in Table 10, via the Micro
Cell Allocator. Port selection is specified in the PSDabel
file or assigned by the PSDcompiler.
PLDs
(cont.)
*
Port D has no output enable (.oe) product terms for ECS4-6 outputs.
External Chip Select PLD
The External Chip Select PLD (ECSPLD) provides the means to select external devices.
The output buffer of the ECSPLD can be configured to operate in high slew rate by writing a
“1” to the corresponding bit in the Drive Register. The slew rate is a measurement of the
rise and fall times of the output. A higher slew rate means a faster output response while a
lower slew rate is a slower response. Refer to Table 26 in the I/O Section for setting up the
Drive Register.
Faster transitions are more likely to cause line reflections and system noise than slower
rates. Adjusting the slew rate allows a trade-off between greater speed and noise
sensitivity. The selection should be based on the performance requirements of the system
and its noise characteristics. Set the corresponding bits in the Drive Register to “0” (for
normal speed) or “1” (for fast drive). The default value is zero.
The ECSPLD has 24 inputs as shown in Table 9. Its outputs are combinatorial, of either
polarity, and have one product term each as shown in Figure 5.
Input Source
Input Name
Number of Bits
MCU Address Bus
A[15:0]*
16
MCU Control Signals
CNTL[2:0]
3
Power Down Signal
PDN**
1
Page Register
PGR[3:0]
4
Table 9. ECSPLD Inputs
*
*
In 80C51XA mode, the address inputs are A[19:4]
**
APD output. When PDN is high, the PSD7XX is in power down mode
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