HC210 datasheet(87/228 Pages) ALTERA

87 / 228 page

Altera Corporation

4–45

September 2008

Hot Socketing

HardCopy II devices offer hot socketing, which is also known as hot

plug-in or hot swap, and power sequencing support without the use of

any external devices. You can insert or remove a HardCopy II device in a

system during system operation without causing undesirable effects to

the running system bus or the board that was inserted into the system.

The hot socketing feature in HardCopy II devices allow:

■

The device can be driven before power-up without any damage to

the device itself.

■

I/O pins remain tri-stated during power-up, so they do no disrupt

bus operation when HardCopy II I/Os are inserted in the system.

■

Signal pins do not drive the VCCIO, VCCPD, or VCCINT power supplies.

■

External input signals to I/O pins of the device do not internally

power the VCCIO or VCCINT power supplies of the device via internal

paths within the device.

Table 4–50. DQS Bus Clock Skew Adder Specifications

(tDQS_CLOCK_SKEW_ADDER) Note (1)

Mode

DQS Clock Skew Adder

Unit

×4 DQ per DQS

×9 DQ per DQS

×18 DQ per DQS

×36 DQ per DQS

Note to Table 4–50:

(1)

This skew specification is the absolute maximum and minimum skew. For example,

skew on a ×4 DQ group is 40 ps or ± 20 ps.

Table 4–51. DQS Phase Offset Delay Per Stage

Note (1)

HardCopy II Devices

Min

Max

Unit

All

Note to Table 4–51

(1)

The delay settings are linear. The valid settings for phase offset are -64 to +63 for

frequency mode 0 and -32 to +31 for frequency modes 1, 2, and 3. The typical

value equals the average of the minimum and maximum values.

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