CS8900A-IQ Cirrus Logic Inc, CS8900A-IQ Datasheet - Page 104

• Manufacturer Part Number: CS8900A-IQ
• Description: Ethernet ICs IC 10Mbps Ethernet Controller 5V
• Manufacturer: Cirrus Logic Inc

Specifications of CS8900A-IQ

• Ethernet Connection Type: 10Base- 2, 10Base- 5, 10Base- F, 10Base- T
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Product: Ethernet Controllers
• Standard Supported: IEEE 802.3
• Data Rate: 10 Mbps
• Maximum Operating Temperature: + 85 C
• Package / Case: LQFP-100
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

5.6.9 Rdy4TxNOW vs. Rdy4Tx
The Rdy4TxNOW bit (Register 18, BusST, bit
8) is used to tell the host that the CS8900A is
ready to accept a frame for transmission. This
bit is used during the Transmit Request pro-
104
Process other events
that caused interrupt
Host Enters Interrupt Routine
No
Host Reads
Exit: can't Issue command
Note: Issuing a command
at this point will cause
previous transmit frame
to be lost.
Rdy4Tx
bit = 1?
ISQ
Figure 31. Transmit Operation in Interrupt Mode
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Yes
Host Writes Transmit Command
Enter Packet Transmit Process
Length to the TxLength Register
Yes
Host Writes Transmit Frame
Exit Transmit Process
to the TxCMD Register
CS8900A Commits
Exit WAIT-for-interrupt
Host Reads the BusST
Register (Register 18)
Transmits Frame
Transmit Frame
Buffer Space to
Transmit Frame
to CS8900A
Host Writes
CS8900A
pending?
No
TxCMD
TxNOW
No
bit = 1?
cess or after the Transmit Request process to
signal the host that space has become avail-
able when interrupts are not being used (i.e.
the Rdy4TxiE bit (Register B, BufCFG, Bit 8) is
Rdy4
Is
Yes
Crystal LAN™ Ethernet Controller
Transmit Request
CS8900A
DS271F5