Z16M1720ASG1868 Zilog, Z16M1720ASG1868 Datasheet - Page 138

• Manufacturer Part Number: Z16M1720ASG1868
• Description: IC PCMCIA INTERFACE 100-VQFP
• Manufacturer: Zilog

Specifications of Z16M1720ASG1868

• Applications: *
• Interface: *
• Voltage - Supply: *
• Package / Case: 100-LQFP
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

UM008101-0601
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7 U G T / C P W C N
Table 15. Control Byte Order (Continued)
Port Designation
Either Port A or Port B can be selected as the source or destination, (illus-
trated in Figure 19) because both ports feature the same degree of program-
mability. When the destination port is also a fixed-address port, see the
section “Fixed-Address Destination Ports.” Port characteristics are spec-
ified in the following control byte groups:
In a transfer, if the direction of transfer (bit 2 of WR0) changes, the WR0
control byte must be preceded by a different control byte, thereby insuring
that the DMA is disabled.
Initialization/Reinitialization Sequence
REINITIALIZE STATUS BYTE
Command
READ MASK FOLLOWS Command
Read Mask Control Byte
INITIATE READ SEQUENCE
Command
FORCE READY Command
ENABLE INTERRUPTS Command
ENABLE DMA Command
Total
Port A
WR0
WR1
WR6
Port B
WR0
WR2
WR4
WR6
Maximum Number of Z80 CPU
Bytes
1
1
1
1
1
1
1
35
Direct Memory Access