參數(shù)資料
型號: 82559
廠商: INTEL CORP
元件分類: 微控制器/微處理器
英文描述: Fast Ethernet Multifunction PCI/CARD bus controller(快速以太網(wǎng)多功能PCI/CARD 總線控制器)
中文描述: 1 CHANNEL(S), 100M bps, LOCAL AREA NETWORK CONTROLLER, PBGA196
封裝: 15 X 15 MM, BGA-196
文件頁數(shù): 30/124頁
文件大小: 1332K
代理商: 82559
82559 — Networking Silicon
20
Datasheet
Flash buffer. When TRDY# is asserted, the 82559 drives valid data on the AD[31:0] lines. The
CPU can also insert wait states by de-asserting IRDY# until it is ready. Flash buffer read accesses
can be byte or word length.
Write Accesses:
The CPU, as the initiator, drives the address lines
AD[31:0],
the command and
byte enable lines
C/BE#[3:0] and
the control lines
IRDY#
and
FRAME#
. It also provides the 82559
with valid data immediately after asserting
IRDY#
. The 82559 controls the
TRDY#
signal and de-
asserts it for a certain number of clocks until valid data is written to the Flash buffer. By asserting
TRDY#
, the 82559 signals the CPU that the current data access has completed. Flash buffer write
accesses can be byte length only.
4.2.1.1.3
Retry Premature Accesses
The 82559 responds with a Retry to any configuration cycle accessing the 82559 before the
completion of the automatic read of the EEPROM. The 82559 may continue to Retry any
configuration accesses until the EEPROM read is complete. The 82559 does not enforce the rule
that the retried master must attempt to access the same address again in order to complete any
delayed transaction. Any master access to the 82559 after the completion of the EEPROM read will
be honored.
Figure 6
below depicts how a Retry looks when it occurs.
Figure 5. Flash Buffer Write Cycle
S
8
CLK
FRAME#
C/BE#
IRDY#
TRDY#
DEVSEL#
AD
ADDR
MEM WR
BE#
STOP#
DATA
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