Prom/Rom/Sram/Eeprom Socket Configuration; Figure 2: Eprom/Rom/Sram/Eeprom Device Orientation - Performance Computer PT-VME151A User Manual

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Section GETTING STARTED

PROM/ROM/SRAM/EEPROM Socket Configuration

Locations U23 and U38 both provide support for read only devices such as ROM, PROM, EPROM, and
Flash EPROM. Location U23 has additional support for read/write devices as well, SRAM and non-vola-
tile SRAM.
The positions of locations U23 and U38 are identified in Figure 1: on page 12 and Figure 2: on page 14.
Both locations are capable of supporting 32 or 28 pin devices. The figure below demonstrates the neces-
sary pin alignment for the respective devices. See CAUTIONS below!

Figure 2: EPROM/ROM/SRAM/EEPROM Device Orientation

BOTTOM
!
CAUTION: WHEN INSERTING 28 OR 32 PIN DEVICES INTO LOCATIONS U23 OR U38 NOTE
THE ORIENTATION OF THE CHIP! THE BOTTOM OF THE CHIP WILL BE ALIGNED WITH
THE BOTTOM OF THE SOCKET STRIPS. THE "BOTTOM" OF THE SOCKET STRIPS ARE THE
ENDS FURTHEST FROM THE VME CONNECTORS. PIN 14 OF A 28 PIN DEVICE SHOULD
ENTER PIN 16 OF THE SOCKET.
!
CAUTION: PIN ONE OF THE CHIP SHOULD BE POINTING TOWARDS THE VME CONNEC-
TORS.
!
CAUTION: THE DEVICE MUST HAVE AN ACCESS TIME OF LESS THAN OR EQUAL TO 200
NS.
14 Extensible Single Board Computer/Controller User's Manual
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32-pin
28-pin