Datasheet > EPC4

EPC4

更新时间： 2022-12-28 03:35:18

品牌	Logo	应用领域
阿尔特拉 - ALTERA		静态存储器
页数	文件大小	规格书
36页	470K
描述
SRAM-Based LUT Devices

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数据手册

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EPC4 数据手册

Configuration Devices for SRAM-Based LUT Devices Data Sheet

The control signals for configuration devices—nCS, OE, and DCLK—

interface directly with APEX II, APEX 20K, Mercury, ACEX 1K, and FLEX

device control signals. All APEX II, APEX 20K, Mercury, ACEX 1K, and

FLEX devices can be configured by a configuration device without

requiring an external intelligent controller.

Device

Configuration

The configuration device’s OEand nCSpins control the tri-state buffer on

the DATAoutput pin, and enable the address counter (and the oscillator in

EPC4, EPC 8, EPC16, EPC2, EPC1, and EPC1441 devices). When OEis

driven low, the configuration device resets the address counter and tri-

states its DATApin. The nCSpin controls the output of the configuration

device. If nCSis held high after the OEreset pulse, the counter is disabled

and the DATAoutput pin is tri-stated. When nCSis driven low, the counter

and DATAoutput pin are enabled. When OEis driven low again, the

address counter is reset and the DATAoutput pin is tri-stated, regardless

of the state of nCS.

The EPC4, EPC8, EPC16, EPC2, EPC1, and EPC1441 devices

determine the operation mode and whether the APEX 20K,

Mercury, ACEX 1K, FLEX 10K, FLEX 8000, or FLEX 6000

protocols should be used when OEis driven high.

When the configuration device has driven out all of its data and has

driven nCASClow, the device tri-states the DATApin to avoid contention

with other configuration devices.

The EPC2 device allows the user to initiate configuration of the PLD via

an additional pin, nINIT_CONF, that can be tied to the nCONFIGpin of the

PLD(s) to be configured. A JTAG instruction causes the EPC4, EPC8,

EPC16, and EPC2 device to drive nINIT_CONFlow, which in turn pulls

nCONFIGlow. The EPC4, EPC8, EPC16, and EPC2 device then drives

nINIT_CONFhigh to start configuration. When the JTAG state machine

exits this state, nINIT_CONFreleases nCONFIGand configuration is

initiated.

An EPC4, EPC8, EPC16, and EPC2 device can be programmed

with a POF generated for an EPC1 or EPC1441 device, however,

an EPC2 device cannot configure FLEX 6000 or FLEX 8000

devices. An EPC1 device can be programmed using a POF

generated for an EPC1441 device.

Altera Corporation

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