ACEX1 datasheet(84/86 Pages) ETC

84 / 86 page

Altera Corporation

ACEX 1K Programmable Logic Device Family Data Sheet

During initialization, which occurs immediately after configuration, the

device resets registers, enables I/O pins, and begins to operate as a logic

device. Before and during configuration, all I/O pins (except dedicated

inputs, clock, or configuration pins) are pulled high by a weak pull-up

resistor. Together, the configuration and initialization processes are called

command mode; normal device operation is called user mode.

SRAM configuration elements allow ACEX 1K devices to be reconfigured

in-circuit by loading new configuration data into the device. Real-time

reconfiguration is performed by forcing the device into command mode

with a device pin, loading different configuration data, re-initializing the

device, and resuming user-mode operation. The entire reconfiguration

process requires less than 40 ms and can be used to reconfigure an entire

system dynamically. In-field upgrades can be performed by distributing

new configuration files.

Conﬁguration Schemes

The configuration data for an ACEX 1K device can be loaded with one of

five configuration schemes (see Table 59), chosen on the basis of the target

application. An EPC16, EPC2, EPC1, or EPC1441 configuration device,

intelligent controller, or the JTAG port can be used to control the

configuration of a ACEX 1K device, allowing automatic configuration on

system power-up.

Multiple ACEX 1K devices can be configured in any of the five

configuration schemes by connecting the configuration enable (nCE) and

configuration enable output (nCEO) pins on each device. Additional

APEX 20K, APEX 20KE, FLEX 10K, FLEX 10KA, FLEX 10KE, ACEX 1K,

and FLEX 6000 devices can be configured in the same serial chain.

Device Pin-

Outs

See the Altera web site (http://www.altera.com) or the Altera Digital

Library

for pin-out information.

Table 59. Data Sources for ACEX 1K Configuration

Configuration Scheme

Data Source

Configuration device

EPC16, EPC2, EPC1, or EPC1441 configuration device

Passive serial (PS)

BitBlaster or ByteBlasterMV download cables, or serial data

source

Passive parallel asynchronous (PPA)

Parallel data source

Passive parallel synchronous (PPS)

Parallel data source

JTAG

BitBlaster or ByteBlasterMV download cables, or

microprocessor with a Jam STAPL File or JBC File

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