PAL16L8 PAL DESIGN SPECIFICATION
BRUCE CULBERTSON   4 OCT 1987
MEMORY CHIP SELECT PAL FOR NS32000 COMPUTER

A15	A16	A17	A18	A19	A20	A21	A22	A23	GND
SWAP	/PROM	PROMA15	/SRAM	/DRAM	NC	NC	NC	NC	VCC

             ; PROM CHIP SELECT: 0-7FFF AND 18000-1FFFF
PROM       = /A23 * /A22 * /A21 * /A20 * /A19 * /A18 * /A17 * /A16 * /A15 +
             /A23 * /A22 * /A21 * /A20 * /A19 * /A18 * /A17 * A16 * A15

             ; PROM MOST SIGNIFICANT ADDRESS BIT: A15 XOR SWAP
/PROMA15   = SWAP * A15 +
             /SWAP * /A15

             ; SRAM CHIP SELECT: 8000-17FFF
SRAM       = /A23 * /A22 * /A21 * /A20 * /A19 * /A18 * /A17 * /A16 * A15 +
             /A23 * /A22 * /A21 * /A20 * /A19 * /A18 * /A17 * A16 * /A15

	     ; DRAM CHIP SELECT
	     ; MEGABYTE 0 MINUS EPROM AND SRAM AREA
	     ; MEGABYTE 1-7
DRAM       = /A23 * /A22 * /A21 * /A20 * A19 +
             /A23 * /A22 * /A21 * /A20 * A18 +
             /A23 * /A22 * /A21 * /A20 * A17 +
             /A23 * /A22 * /A21 * A20 +
             /A23 * A21 +
             /A23 * A22