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参数资料
| 型号： | MB86703PF |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PQFP80 |
| 封装： | 14 X 20 MM, 0.80 MM PITCH, PLASTIC, QFP-80 |
| 文件页数： | 9/32页 |
| 文件大小： | 189K |
| 代理商： | MB86703PF |
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Plug and Play ISA Controller
MB86703
17
CONTROL REGISTER SUMMARY
Plug and Play cards respond to commands written to
Plug and Play registers as well as certain ISA bus
conditions. These commands are summarized
below:
RESET_DRV - This is the ISA bus reset signal. Upon
detection of this signal, the Plug and Play card enters
the
Wait for Key state and all CSNs are reset to 0x00.
Default values are loaded from non-volatile memory
to the conguration registers. A logical device
becomes active at reset if the /ACTENA pin is
asserted (low) and the corresponding Activate bit in
the EEPROM, address 0x01B, is set. If the
/ACTENA pin is negated, the values in the EEPROM
are ignored and the logical devices are not activated
at power-up reset. The state of the pin has no effect
on the ability of software to set or reset each logical
device’s Activate register (0x30) during the congura-
tion process.
Note:
The
software
must
delay
1
msec
after
RESET_DRV before accessing the auto-configuration
ports.
Cong Control Register - The Cong Control
Register enables assertions of three independent
commands which are activated by writing a “1” to
their corresponding register bits. These bits are
automatically reset to “0” by the hardware after the
commands execute.
- Reset command - The Reset command is sent
to the Plug and Play cards by writing a value of
0x01 to the Cong Control register. All Plug and
Play cards in any state, except those in
Wait for
Key, respond to this command. This command
performs a reset function on all logical devices.
This resets the contents of conguration
registers to their default state. The conguration
registers for all logical devices are loaded with
their power up values from non-volatile memory.
The READ_DATA port, CSN and Plug and Play
state are preserved.
- Wait for Key command - The Wait for Key
command is sent to the Plug and Play cards by
writing a value of 0x02 to the Cong Control
register. All Plug and Play cards in any state will
respond to this command. The CSNs are
preserved and no logical device status is
changed.
- Reset CSN command - The Reset CSN
command is sent to the Plug and Play cards by
writing the value of 0x04 to the Cong Control
register. All Plug and Play cards in any state
except
Wait for Key will reset their CSN to 0x00.
- Writing 0x07 to the Cong Control Register is
equivalent to a RESET_DRV event.
Note: The software must delay for 1 ms after the Reset
command before accessing the auto-configuration
ports.
Set RD_DATA Port Command - This command is
used in the
Isolation state and sets the address of
the READ_DATA port. Write data bits [7:0] are
used as ISA I/O bus address bits [09:02]. The ISA
bus address bits [1:0] are xed at binary “11”. The
ISA bus address bits [15:10] are xed at binary
‘”000000”.
Note: After a RESET_DRV or Reset CSN command,
this register is considered uninitialized and must be rein-
itialized.
Serial Isolation Register - A read from the Serial
Isolation Register causes Plug and Play cards in
the
Isolation state to respond to the ISA bus read
cycle.
Card Select Number - A Card Select Number is
uniquely assigned to each Plug and Play card
when the card has been isolated and is the only
card in the
Isolation state. An unidentied card is
assigned a value of zero. Valid Card Select
Numbers for identied ISA cards range from 1 to
255 and must be assigned sequentially starting
from 1. The Card Select Number is used to select
a card via the Wake[CSN] command. The Card
Select Number on all ISA cards is set to zero on a
RESET_DRV or Reset CSN command. The CSN
is never set to zero using the CSN register.
Wake[CSN] Command - This command is used to
bring ISA cards in the
Sleep state into either the
Isolation state or the Conguration state. A
Wake[CSN] command with a parameter of zero
will force all cards without a CSN to enter the
Isolation state. A Wake[CSN] command with a
parameter other than zero will force a card with a
matching CSN to enter the
Conguration state.
Any card in the
Isolation or Conguration state that
receives a Wake[CSN] command with a parameter
that does not match its CSN will transition to the
Sleep state. All Plug and Play cards function as if
their 72-bit serial identier and their resource data
come from a single serial device. The pointer to
this data is reset to the beginning whenever a card
receives a Wake[CSN] command that has a non-
zero CSN value.
Resource Data Register - One byte of resource
data from the Plug and Play card is returned upon
a read of this register when in the
Conguration
state. This data is always returned byte
sequentially and the Status register must be read
to conrm that resource data is available before
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