Z80382 Datasheet, PDF (46/77 Pages) Zilog, Inc. – HIGH-PERFORMANCE DATA COMMUNICATIONS PROCESSORS

Z80382/Z8L382
High-Performance Data Communications Processors
HOST INTERFACE (Continued)
Base Address Registers
These seven registers are written by the 380C with the
base addresses of 8-byte windows in the hostÕs I/O ad-
dress space which the host can use to communicate with
the host-accessible registers in the Mimic.
Configuration Registers
There are five configuration registers of the PCMCIA 3.0
standard and additionally a version number register, two
image base address registers, and the seven base ad-
dress registers described above. The Host accesses these
registers to configure the interface and to retrieve status.
Configuration Option Register. This register is used on
one side to configure the PCMCIA interface, controlling
items such as type of interrupt, DMA enable, and selection
of the Base Address Register. On the other side, a reset
can be triggered by setting a certain bit.
Card Configuration and Status Register. This register
contains information about the status of the interface, in-
cluding whether certain signals have changed, interrupts,
and power down.
Pin Replacement Register. This register is used to pro-
vide the status information which is otherwise provided on
the /PCIRQ pin (RDY/BSY).
Socket and Copy Register. The Socket and Copy regis-
ter is implemented for PCMCIA hosts expecting this op-
tional PCMCIA register in a PCMCIA card. The register
has no function in the Z382.
Zilog
Extended Status Register.The extended status register
is used to enable and provide status information of exter-
nal events.
Image Base Address Registers. These registers deliver
a copy of the configured base address.
Interface Version Number Register. This register pro-
vides the version number of the PCMCIA interface. It also
contains a bit which can be written to disable attribute
memory write protection, allowing the host to write to the
attribute memory.
Z380 Control Register. The Z380 Control Register (ZCR)
controls the functions of the PCMCIA block by means of
the Z380 controller. Accessible only to the 380C, it controls
access to the attribute memory by the 380C and allows the
380C to signal major status changes to the host.
Decoding and Routing Functions
The PCMCIA interface uses the values programmed in the
Configuration Registers to decode a Mimic chip select
when the host I/O address signals match the programmed
conditions.
Unlike the Plug and Play interface the PCMCIA interface
does not perform any routing functions on interrupt and
DMA control signals. These are performed at the PCMCIA
socket controller on the host side.
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PRELIMINARY
DS97Z382000