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LAN9117 데이터시트(PDF) 100 Page - Microchip Technology

부품명 LAN9117
부품 상세설명  High Performance Single-Chip 10/100 Non-PCI Ethernet Controller
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
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LAN9117 데이터시트(HTML) 100 Page - Microchip Technology

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LAN9117
DS00002267A-page 100
 2005-2016 Microchip Technology Inc.
6.5
RX Data FIFO Direct PIO Burst Reads
In this mode the upper address inputs are not decoded, and any burst read of the LAN9117 will read the RX Data FIFO.
This mode is enabled when FIFO_SEL is driven high during a read access. This is normally accomplished by connecting
the FIFO_SEL signal to a high-order address line. This mode is useful when the host processor must increment its
address when accessing the LAN9117. Timing is identical to a PIO Burst Read, and the FIFO_SEL signal has the same
timing characteristics as the address lines. In this mode, performance is improved by allowing an unlimited number of
back-to-back DWORD or WORD read cycles. RX Data FIFO Direct PIO Burst Reads can be performed using Chip
Select (nCS) or Read Enable (nRD). When either or both of these control signals go high, they must remain high for the
period specified.
Note that address lines A[2:1] are still used, and address bits A[7:3] are ignored.
FIGURE 6-4:
RX DATA FIFO DIRECT PIO BURST READ CYCLE TIMING
Note:
The “Data Bus” width is 16 bits.
FIGURE 6-5:
RX DATA FIFO DIRECT PIO BURST READ CYCLE TIMING
Symbol
Description
MIN
TYP
MAX
Units
tcsh
nCS, nRD Deassertion Time
13
ns
tcsdv
nCS, nRD Valid to Data Valid
30
ns
tacyc
Address Cycle Time
45
tasu
Address, FIFO_SEL Setup to nCS, nRD Valid
0
ns
tadv
Address Stable to Data Valid
40
tah
Address, FIFO_SEL Hold Time
0
ns
tdon
Data Buffer Turn On Time
0
ns
tdoff
Data Buffer Turn Off Time
7
ns
tdoh
Data Output Hold Time
0
ns
Note:
An RX Data FIFO Direct PIO Burst Read cycle begins when both nCS and nRD are asserted. The cycle
ends when either or both nCS and nRD are deasserted. They may be asserted and deasserted in any
order.
Data Bus
nCS, nRD
FIFO_SEL
A[2:1]


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