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參數(shù)資料
| 型號(hào)： | 18V512JC |
| 廠商： | Xilinx, Inc. |
| 英文描述： | In-System Programmable Configuration PROMs |
| 中文描述： | 在系統(tǒng)可編程配置PROM的 |
| 文件頁(yè)數(shù)： | 12/21頁(yè) |
| 文件大小： | 230K |
| 代理商： | 18V512JC |
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R
Reset Activation
On power up, OE/RESET is held low until the XC18V00 is
active (1 ms). OE/RESET is connected to an external resis-
tor to pull OE/RESET HIGH releasing the FPGA INIT and
allowing configuration to begin. If the power drops below
2.0V, the PROM resets. OE/RESET polarity is
not
program-
mable. See
Figure 8
for power-up requirements.
Standby Mode
The PROM enters a low-power standby mode whenever
CE is asserted High. The address is reset. The output
remains in a high-impedance state regardless of the state of
the OE input. JTAG pins TMS, TDI and TDO can be in a
high-impedance state or High. See
Table 7
.
5V Tolerant I/Os
The I/Os on each re-programmable PROM are fully 5V tol-
erant even through the core power supply is 3.3V. This
allows 5V CMOS signals to connect directly to the PROM
inputs without damage. In addition, the 3.3V V
CCINT
power
supply can be applied before or after 5V signals are applied
to the I/Os. In mixed 5V/3.3V/2.5V systems, the user pins,
the core power supply (V
CCINT
), and the output power sup-
ply (V
CCO
) can have power applied in any order. This
makes the PROM devices immune to power supply
sequencing issues.
Customer Control Bits
The XC18V00 PROMs have various control bits accessible
by the customer. These can be set after the array has been
programmed using
“
Skip User Array
”
in Xilinx iMPACT soft-
ware. The iMPACT software can set these bits to enable the
optional JTAG read security, parallel configuration mode, or
CF-->D4 pin function. See
Table 7
.
Figure 8:
V
CCINT
Power-Up Requirements
Time (ms)
V
3.6V
3.0V
0V
Recommended Operating Range
Recommended
V
CCINT
Rise
Time
1ms
50ms
0ms
ds026_10_061103
Table 7:
Truth Table for PROM Control Inputs
Control Inputs
Internal Address
Outputs
OE/RESET
CE
DATA
CEO
I
CC
Active
Reduced
High
Low
If address < TC
(1)
: increment
If address > TC
(1)
: don
’
t change
Active
High-Z
High
Low
Low
Low
Held reset
High-Z
High
Active
High
High
Held reset
High-Z
High
Standby
Low
High
Held reset
High-Z
High
Standby
Notes:
1.
TC = Terminal Count = highest address value. TC + 1 = address 0.
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