Programmable Logic Devices April 2000, ver. Preliminary Info

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Programmable Logic Devices April 2000, ver. Preliminary Info

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APEX 20KE
Programmable Logic Devices
April 2000, ver.
Preliminary Information
This errata sheet provides updated guidelines APEX20KE device configuration applies currently shipping devices only (future devices will affected). APEX 20KE devices operate power sources: VCCINT, which powers core, VCCIO, which powers buffers. guidelines below assume that VCCIO also powers EPC2 device operates ensure successful configuration possible power-up sequencing conditions between APEX device EPC2 device, pull nCONFIG VCCINT connect nINIT_CONF EPC2 device. With this method, VCCINT decline voltage, device will successfully reconfigure when power restored. Figure shows configuration block diagram this method.
Figure Configuration Block Diagram
VCCINT
APEX 20KE Device
DCLK DATA0 nSTATUS CONF_DONE nCONFIG MSEL0 MSEL1 nCEO N.C.
EPC2 Device
DCLK DATA nINIT_CONF
Notes:
pull-up resistor should connected same supply voltage configuration device. pull-up resistors EPC2 device's pins have internal, user-configurable pull-up resistors. internal pull-up resistors used, external pull-up resistors should used these pins. nINIT_CONF available EPC2 devices only. nINIT_CONF available (i.e., EPC1 devices) used, nCONFIG must pulled either directly through resistor. nCEO left unconnected.
Altera Corporation
M-ES-APEX-01.1
APEX 20KE Programmable Logic Devices
Initiate Configuration feature uses Joint Test Action Group (JTAG) instruction initiate configuration process with EPC2 device. This feature supported inserting diode between APEX 20KE nCONFIG EPC2 nINIT_CONF pin, shown Figure Select diode with threshold voltage (VT) less than equal diode effectively makes nINIT_CONF open-drain, will only able drive tri-state.
Figure Configuration Block Diagram (with Initiate Configuration Feature)
VCCINT
APEX 20KE Device
DCLK DATA0 nSTATUS CONF_DONE nCONFIG MSEL0 MSEL1 nCEO N.C.
EPC2 Device
DCLK DATA nINIT_CONF
Notes:
pull-up resistor should connected same supply voltage configuration device. pull-up resistors EPC2 device's pins have internal, user-configurable pull-up resistors. internal pull-up resistors used, external pull-up resistors should used these pins. nINIT_CONF available EPC2 devices only. nINIT_CONF available (i.e., EPC1 devices) used, nCONFIG must pulled either directly through resistor. nCEO left unconnected.
Application Note (Configuring APEX 20K, FLEX 10K, FLEX 6000 Devices) recommends pulling nCONFIG same supply EPC2 device. following guidelines should followed when nCONFIG pulled same supply EPC2.
successful configuration when VCCIO pins APEX 20KE EPC2 devices connected power-up VCCINT first EPC2 device second. successful configuration when EPC2 device powered-up first, must power-up VCCINT supply within EPC2 device power-up. VCCINT declines below point, following initiate configuration:
Altera Corporation
APEX 20KE Programmable Logic Devices
power-monitoring circuit board. This circuit will strobe nCONFIG when VCCINT range then high when returns normal operating level. Have microcontroller intelligent host strobe nCONFIG then high when VCCINT returns normal operating level.
more information configuration, refer Application Note (Configuring APEX 20K, FLEX 10K, FLEX 6000 Devices).
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Altera, APEX, APEX 20KE, EPC2 trademarks and/or service marks Altera Corporation United States other countries. Altera acknowledges trademarks other organizations their respective products services mentioned this document. Altera products protected under numerous U.S. foreign patents pending applications, maskwork rights, copyrights. Altera warrants performance semiconductor products current specifications accordance with Altera's standard warranty, reserves right make changes products services time without notice. Altera assumes responsibility liability arising application information, product, service described herein except expressly agreed writing Altera Corporation. Altera customers advised obtain latest version device specifications before relying published information before placing orders products services. Copyright 2000 Altera Corporation. rights reserved.
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Altera Corporation

Programmable Logic Devices April 2000, ver. Preliminary Info

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