KSZ8851SNLI Micrel Inc, KSZ8851SNLI Datasheet - Page 28

KSZ8851SNLI

Manufacturer Part Number
KSZ8851SNLI
Description
Manufacturer
Micrel Inc
Datasheet

Specifications of KSZ8851SNLI

Operating Supply Voltage (typ)
3.3V
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
32
Lead Free Status / RoHS Status
Supplier Unconfirmed

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August 2009
Micrel, Inc.
Host receives an multiple Ethernet pkts
from upper layer and prepares transmit
Write an 1?to RXQCR[3] reg to enable
that the TXQ has completed to transmit
ID). Each transmit queue frame format
Option to read ISR[14] reg, it indicates
data (control word, byte count and pkt
TXQ write access, then Host issues a
data) to TXQ memory. This is moving
SPI opcode=11 to start write transmit
pkts data (data, data_length, frame
Write an 0?to RXQCR[3] reg to end
to issue a transmit command (auto-
enqueue) to the TXQ. The TXQ will
KSZ8851SNL TXQ memory until all
Memory size is available for these
transmit all data to the PHY port
Write an 1?to TXQCR[2] reg
all pkts to the PHY port, then
Check if KSZ8851SNL TXQ
transmit data from Host to
Write 1?to clear this bit
Figure 12. Host TX Multiple Frames in Auto- Enqueue Flow Diagram
is shown in Table 6
(Read TXMIR Reg)
TXQ write access
pkts are finished
transmit pkts?
Yes
No
28
Yes
word count in TXNTFSR[15:0] register
Write the total amount of TXQ buffer
transmit total frames size in double-
enable the TXQ memory available
Set bit 1=1 in TXQCR register to
space which is required for next
(memory space available)
and check if the bit 6=1
Wait for interrupt
in ISR register
monitor
?
No
KSZ8851SNL/SNLI
M9999-083109-2.0

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