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參數(shù)資料
| 型號： | CDK8920A |
| 廠商： | Cirrus Logic, Inc. |
| 英文描述： | CRYSTAL LAN ISA PLUG-AND-PLAY ETHERNET CONTROLLER |
| 中文描述： | 水晶藍(lán)的ISA即插即用，即插即用以太網(wǎng)控制器 |
| 文件頁數(shù)： | 25/144頁 |
| 文件大?。?/td> | 1229K |
| 代理商： | CDK8920A |
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As an example, to configure the CS8920A to use
a 16-Kbyte (128-Kbit) PROM mapped into host
memory at a starting address of D0000h, write
0D00h to the BootPROM Base Address register
and write 0FC0h into the BootPROM Address
Mask register. (The mask value for a 16-Kbyte
PROM is 0FC00h. See Section 4.8 for more in-
formation on determing the BootPROM Address
and Mask register values.)
3.8
Low-Power Modes
For power-sensitive applications, the CS8920A
supports three low-power modes: Hardware
Standby, Hardware Suspend, and Software Sus-
pend. All three low-power modes are controlled
through the SelfCTL register (Register 15).
An internal reset occurs when the CS8920A
comes out of any suspend or standby mode. Af-
ter a reset (internal or external), the CS8920A
goes though a self configuration. This includes
calibrating on-chip analog circuitry, and reading
EEPROM for validity and configuration. When
the calibration is done, bit InitD in Register 16
(Self Status register) is set indicating that initiali-
zation is complete, and the SIBusy bit in the
same register is cleared (indicating that the
EEPROM is no longer being read or pro-
grammed. Time required for the reset calibration
is typically 10 ms. Software drivers should not
access registers internal to CS8920A during this
time.
Hardware Standby
Hardware (HW) Standby is designed for use in
systems, such as portable PC’s, that may be tem-
porarily disconnected from the 10BASE-T cable.
It allows the system to conserve power while the
LAN is not in use, and then automatically re-
store Ethernet operation once the cable is
reconnected.
In HW Standby mode, all analog and digital cir-
cuitry in the CS8920A is turned off, except for
the 10BASE-T receiver which remains active to
listen for link activity. If link activity is detected,
the LANLED pin is driven low, providing an in-
dication to the host that the network connection
is active. The host can then activate the
CS8920A by de-asserting the SLEEP pin. Dur-
ing this mode, all ISA bus accesses are ignored.
CS8920A Configuration
SLEEP
(Pin 116)
CS8920A Operation
HWstandbyE
(SelfCTL, Bit
A)
Set
HWSleepE
(SelfCTL, Bit 9)
SWSuspend
(SelfCTL, Bit 8)
Link Pulses
Low
Set
Clear
Not Present
HW Standby mode:
10BASE-T receiver listens for
link activity
HW Standby mode:
LANLED low
HW Suspend mode
CS8920A resets and goes
through Initialization
Not in any sleep mode
SW Suspend mode
Not in any sleep mode
Low
Set
Set
Clear
Receiver
Activity
N/A
N/A
Low
Low to High
Clear
N/A
Set
Set
Clear
Clear
High
Low
Low
N/A
N/A
N/A
N/A
Clear
Clear
Clear
Set
Clear
N/A
N/A
N/A
NOTE: Both HW Standby and HW Suspend take precedence over SW Suspend.
Table 3.8. Low-Power Mode Operation
CS8920A
DS238PP2
25
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