CS8900A-IQR Cirrus Logic Inc, CS8900A-IQR Datasheet - Page 98
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CS8900A-IQR
Manufacturer Part Number
CS8900A-IQR
Description
Ethernet ICs IC 10Mbps Ethernet Controller 5V
Manufacturer
Cirrus Logic Inc
Datasheet
1.CS8900A-CQZ.pdf
(138 pages)
Specifications of CS8900A-IQR
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
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5.5.4 Keeping StreamTransfer Mode
Active
When the CS8900A initiates a StreamTransfer
cycle, it will continue to execute cycles as long
as the following conditions hold true:
•
Interrupt
Request
Interrupt
Request
98
updates the DMA Start-of-Frame register
(PacketPage base + 0026h);
updates the DMA Frame Count register
(PacketPage base + 0028h);
updates DMA Byte Count register (Packet-
Page base + 002Ah);
sets the RxDMAFrame bit (Register C,
BufEvent, Bit 7); and,
generates an RxDMAFrame interrupt.
all packets received are of legal length with
valid CRC;
4 Back-to-Back Frames
4 Back-to-Back Frames
Figure 28. Receive Example Without Stream Transfer
Figure 29. Receive DMA Configuration Options
CIRRUS LOGIC PRODUCT DATASHEET
9 Interrupts for 9 "Good" Packets
2 Interrupts for 9 "Good" Packets
T > 52 us
T > 52 us
•
•
If any of these conditions are not met, the
CS8900A exits StreamTransfer by generating
RxOK and RxDMA interrupts. The CS8900A
then returns to either Memory, I/O, or DMA
mode, depending on configuration.
5.5.5 Example of StreamTransfer
Figure 28 shows how four back-to-back
frames, followed by five back-to-back frames,
would be received without StreamTransfer.
Figure 29 shows how the same sequence of
frames would be received with StreamTrans-
fer.
each packet follows its predecessor by less
than 52 ms; and,
the DA of each packet passes the DA filter.
Crystal LAN™ Ethernet Controller
5 Back-to-Back Frames
5 Back-to-Back Frames
Time
Time
CS8900A
DS271F5
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