Instruction Manual

DS271F5 137
CS8900A
Crystal LAN™ Ethernet Controller
CIRRUS LOGIC PRODUCT DATASHEET
10.3 Acronyms Specific to the CS8900A
BufCFG Buffer Configuration - Register B
BufEvent Buffer Event - Register C
BusCTL Bus Control - Register 17
BusST Bus State - Register 18
ENDEC Manchester encoder/decoder
ISQ Interrupt Status Queue - register 0
LineCTL Ethernet Line Control - Register 13
LineST Ethernet Line Status - Register 14
RxCFG Receive Configuration - Register 3
RxCTL Receive Control - Register 5
RxEvent Receive Event - Register 4
SelfCTL Self Control - Register 15
SelfST Self Status - Register 16
TestCTL Test Control - Register 19
TxCFG Transmit Configuration - Register 7
TxCMD Transmit Command
TxEvent Transmit Event - Register 8
10.4 Definitions Specific to the CS8900A
Act-Once bit
A control bit that causes the CS8900A to take a certain action once when a logic "1" is
written to that bit. To cause the action again, the host must rewrite a "1".
Committed Receive Frame
A receive frame is said to be "committed" after the frame has been buffered by the
CS8900A, and the host has been notified, but the frame has not yet been transferred
by the host.
Committed Transmit Frame
A transmit frame is said to be "committed" after the host has issued a Transmit
Command, and the CS8900A has reserved buffer space and notified the host that it is
ready for transmit.
Event or Interrupt Event
The term "Event" is used in this document to refer to something that can trigger an
interrupt. Items that are considered "Events" are reported in the three Event registers
(RxEvent, TxEvent, or BufEvent) and in two counter-overflow bits (RxMISS and
TxCOL).
StreamTransfer
A method used to significantly reduce the number of interrupts to the host processor
during block data transfers (Patent Pending).
PacketPage
A unified, highly-efficient method of controlling and getting status of a peripheral
controller in I/O or Memory space.