9-IO - Refresher Tristate buffer E 0 0 1 1 O I E I 0 1 0 1...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Refresher Tristate buffer I O E E I O 0 0 Z 0 1 Z 1 0 0 1 1 1 Decoder 2:4 I 0 I 1 Y 0 Y 1 Y 2 Y 3 I 1 I 0 0 0 0 0 0 1 0 1 0 0 1 0 1 0 0 1 0 0 1 1 1 0 0 0 Y 3 Y 2 Y 1 Y 0 I O E
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Memory (RAM/ROM) RAM (Random Access Memory) SRAM static RAM flip flops store data used for DRAM dynamic RAM capacitors store data used for
Background image of page 2
ROM (Read Only Memory) Masked ROM programmed during manufacturing PROM OTP: one-time programmable EPROM re-programmable erasable through UV light EEPROM/Flash ROM re-programmable erasable through voltage
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
e.g.,: 8K RAM/ROM; 8 K = 8192 memory cells (8-bit wide) 8192 = 2 13 13 address lines address lines data lines A 0 A 12 . . . D 0 D 7 . . . CE R/W CE = chip enable = 0: chip disabled 1: chip enabled R/W = read/write = 0: write (proc. memory) 1: read (memory proc.) occurs when chip enabled Processor provides R/W signal plus E-clock; read/write occurs when E = 1 E = ¼ system clock = 2 MHz
Background image of page 4
? What does it mean to enable/disable memory ? RAM
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/05/2011 for the course CS 3280 taught by Professor Michael during the Spring '09 term at Missouri (Mizzou).

Page1 / 10

9-IO - Refresher Tristate buffer E 0 0 1 1 O I E I 0 1 0 1...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online