Z0847006PSG Zilog, Z0847006PSG Datasheet - Page 57

• Manufacturer Part Number: Z0847006PSG
• Description: IC 6MHZ Z80 NMOS DART 40-DIP
• Manufacturer: Zilog
• Series: Z80r

Specifications of Z0847006PSG

• Processor Type: Z80
• Features: Dual Channel Asynchronous Receiver/Transmitter (DART)
• Speed: 6MHz
• Voltage: 5V
• Mounting Type: Through Hole
• Package / Case: 40-DIP (0.620", 15.75mm)
• Mounting Style: Through Hole
• Cpu Speed: 6MHz
• Digital Ic Case Style: DIP
• No. Of Pins: 40
• Supply Voltage Range: 5V
• Operating Temperature Range: 0°C To +70°C
• Svhc: No SVHC (18-Jun-2010)
• Base Number: 847006
• Rohs Compliant: Yes
• Clock Frequency: 6MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

UM008101-0601
Block Transfer
Simultaneous
also requires external logic and inhibits memory refresh. Additionally, it
reduces DMA throughput.
All DMA transfers interrupt dynamic memory refresh by the CPU and
most of them idle the CPU. It is, therefore, important to consider these
implications when making the trade-off for higher DMA transfer speed.
Conventional
Figure 16.
Programmed
Z80/Z8000
Instruction
Sequential
Instruction
Instruction
Sequence
Transfers
DMA
DMA
D.
B.
C.
A.
Conceptual Comparison of Various I/O Transfer Methods
CPU
CPU
CPU
CPU
Fetch and Read Cycles
Read Cycle
Write Cycle
MEMORY
MEMORY
MEMORY
MEMORY
Write Cycle
Read/Write Cycle
Read Cycle
I/O
I/O
I/O
I/O
Write Cycle
<   % 2 7 2 G T K R J G T C N U
Direct Memory Access
DMA
DMA
DMA
DMA
7 U G T / C P W C N
BUS
BUS
BUS
BUS