Differential ECL Ouput Module
Block Diagram
DESCRIPTION
The ICE-D2E Module is a TTL to differential ECL converter for use on an ICE card with a 16-bit digital I/O site. It converts the module site TTL levels to F100K differential ECL logical levels (compatible with standard Midas switch connections).
The output connector is a 40 pin ribbon cable with data bit 0 on pins 1&40, bit 1 on pins 2&39, … , bit 15 on pins 16&25, and clock on pins 20&21.
SERIES 2 CARDS:
An external clock can be connected via SMB connector on the card edge and is jumpered to be DC coupled TTL levels or an AC coupled 1Vpp sine wave. The clock also has a jumper that applies a 50 ohm termination to ground.
An internal clock is also available via software control. It is the on-board crystal 40MHz divided by an integer from 1 to 65535.
H3 – Closed for 50 ohm termination
H4 – Closed for DC coupled clock input (0-5V)
Open for AC coupled clock input (1Vpp)
In standard configurations, the 40 pin connector will be cabled through the card edge connector to an 40 pin male IDC connector rouglhly 3-4 inches from outside of the chassis.
SERIES 3 CARDS:
There are three clock sources, all located on the motherboard, and are selectable via software control. The default clock is an external source connected to the motherboard SMB connector, usually a 1Vpp sine wave. The internal clock (INTCLK) is the on-board 40MHz crystal divided by an integer from 1 to 65535. The alternate clock (ALTCLK) is the socketed crystal X2 on the motherboard.