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TLK105LRHBT Datasheet(PDF) 11 Page - Texas Instruments |
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TLK105LRHBT Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 105 page  TLK105L TLK106L www.ti.com SLLSEE3A – AUGUST 2013 – REVISED NOVEMBER 2013 3.3 IO Pins Hi-Z State During Reset The following IO or output pins are in hi-Z state when RESET is active (Low). Internal Internal Pin Name Type Pin Name Type PU/PD PU/PD TXD_3 IO PD COL (MLED(1)) IO PU TX_EN IO PD RXD_0 IO PD INT/PWDN IO PU RXD_1 IO PD LED_LINK (MLED(1)) IO PU RXD_2 IO PD MDIO IO RXD_3 IO PD RX_DV IO PD TX_CLK O CRS IO PU CLK25MHz_OUT O RX_ER IO PU RX_CLK O (1) * MLED can be routed via REG 0x0025 (MLEDCR Register), for further details see Section 3.8. 3.4 Auto-Negotiation The TLK10xL device auto-negotiates to operate in 10Base-T or 100Base-TX. With Auto-Negotiation enabled, the TLK10xL negotiates with the link partner to determine the speed and duplex mode. If the link partner cannot Auto-Negotiate, the TLK10xL device enters parallel-detect mode to determine the speed of the link partner. Parallel-detect mode uses fixed half-duplex mode. The TLK10xL supports four different Ethernet protocols (10Mbs Half-Duplex, 10Mbs Full-Duplex, 100Mbs Half-Duplex, and 100Mbs Full-Duplex). Auto-Negotiation selects the highest performance protocol based on the advertised ability of the Link Partner. Control the Auto-Negotiation function within the TLK10xL by internal register access according to the IEEE specification. Alternatively, control the HD-FD functionality by configuring the AN_0 pins. The state of AN_0 selects full or half duplex mode, both in Auto-negotiation or force 100/10 mode as given in Table 3-1. The state of AN_0 upon power-up/reset, determines the state of bits [8:5] of the ANAR register (0x04h). Auto-Negotiation advertises ANEN, 100BT by default. Full-Duplex or Half-Duplex configuration is available through the AN_0 bit. Internal register access configures the device for a specific mode. Table 3-1. Auto-Negotiation Modes AN_0 Forced Mode 0 10Base-T, Half-Duplex 100Base-TX, Half-Duplex 1 10Base-T, Half or Full-Duplex 100Base-TX, Half or Full-Duplex Internal register access controls the Auto-Negotiation function, as defined by the IEEE 802.3u specification. For further detail regarding Auto-Negotiation, see Clause 28 of the IEEE 802.3u specification. 3.5 Auto-MDIX The TLK10xL device automatically determines whether or not it needs to cross over between pairs, eliminating the requirement for an external crossover cable. If the TLK10xL interoperates with a device that implements MDI/MDIX crossover, a random algorithm as described in IEEE 802.3 determines which device performs the crossover. Auto-MDIX is enabled by default and can be configured via pin strap, control register CR1 (0x09h), bit 14 or via register PHYCR (0x19h), bit 15. Copyright © 2013, Texas Instruments Incorporated Hardware Configuration 11 Submit Documentation Feedback Product Folder Links: TLK105L TLK106L |
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