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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： | 2/32页 |
| 文件大小： | 189K |
| 代理商： | MB86703PF |
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MB86703
Plug and Play ISA Controller
10
Plug and Play software to select this card later in the
conguration process, without going through the proto-
col again.
The four Plug and Play states (see Figure 1) are sum-
marized as follows:
Wait for Key - Upon power-up reset and Wait for Key
commands, all cards enter this state. No commands
are active in this state until the initiation key is
detected on the ISA bus. It is the default state for
Plug and Play cards during normal system
operation. After conguration and activation,
software should return all cards to this state.While in
the
Wait for Key state, cards do not respond to any
access to their auto-conguration ports until the
initiation key is detected. All ISA accesses from the
Plug and Play interface to the cards are ignored.
Sleep - Plug and Play cards wait for a Wake[CSN]
command in this state. Based on the write data and
the value of the CSN on each card, this command
will selectively enable one or more cards to the
Isolation or Conguration states. To exit this state,
the value of the write data bits[7:0] of the Wake[CSN]
command must match the card’s CSN. If the write
data for Wake[CSN] is zero, then all cards that have
not been assigned a CSN will enter the
Isolation
state. If the write data for the Wake[CSN] command
is nonzero, then the one card whose assigned CSN
matches the parameter of the Wake[CSN] command
will enter the
Conguration state.
Isolation - The rst time the cards enter the Isolation
state, it is necessary to set the READ_DATA port
address using the Set RD_DATA port command.
Seventy-two pairs of reads are performed to the
Serial Isolation register to isolate a card. If the
checksum read from the card is valid, then one card
has been isolated. The isolated card remains in the
Isolation state. All other cards which have failed the
isolation protocol will return to the
Sleep state. The
isolated card is assigned a unique value called the
Card Select Number (CSN) and transitions to the
Conguration state. The Wake[0] command causes
the card to transition back to the
Sleep state and all
cards with a CSN value of zero to transition to the
Isolation state. This entire process is repeated until
all Plug and Play cards are detected.
Conguration -In this state, the card responds to all
conguration commands including reading the card’s
resource conguration information and programming
the card’s resource selections. Only one card may
be in this state at a time.
Figure 1. Plug and Play Configuration
Process States
Notes:
1. CSN = Card Select Number.
2. RESET_DRV causes a state transition from the current
state to
Wait for Key and sets all CSNs to zero. All logical
devices are set to their power-up configuration values.
3. The
Wait for Key command causes a state transition from
the current state to
Wait for Key.
Auto-Conguration Ports
Three 8-bit ports are used by the software to access
the conguration space on each Plug and Play ISA
card. The ports are listed in Table 1. These registers
are used by the Plug and Play software to issue com-
mands, check status, access the resource data infor-
mation, and congure the Plug and Play hardware.
The ports have been chosen to avoid conicts in the
installed base of ISA functions, while at the same time
minimizing the number of ports needed in the ISA I/O
space.
Notes:
1. Address is 0x0259 if the MB86703 is in NEC mode.
2. Address is 0x0A59 if the MB86703 is in NEC mode.
Table 1. Auto-Configuration Ports
PORT NAME
LOCATION
TYPE
ADDRESS
0x0279(1)
Write-only
WRITE_DATA
0x0A79(2)
Write-only
READ_DATA
Relocatable in range
0x0203 to 0x03FF
Read-only
Power up
RESET_DRV
State
Active Commands
Wait for Key
No active commands
Active Commands
Sleep
Reset
State
Active Commands
State
Active Commands
Isolation
Config
Reset
Wait for Key
Set RD_DATA Port
Serial Isolation
Wake [CSN]
Reset
Wait for Key
Resource Data
Status
Logical Device
I/O Range Check
Activate
Configuration Registers
Wake [CSN]
Wait for Key
Wake[CSN]
State
Set CSN = 0
Initiation key
CSN=0
Wake0 and
Wake=CSN
Wake=0 and
WakeCSN
Lose serial isolation
or WAKECSN
Set
CSN
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